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Template:Continuum mechanics In fluid dynamics, the Hagen–Poiseuille equation, also known as the Hagen–Poiseuille law, Poiseuille law or Poiseuille equation, is a physical law that gives the pressure drop in a fluid flowing through a long cylindrical pipe. It can be successfully applied to air flow in lung alveoli, for the flow through a drinking straw or through a hypodermic needle. It was experimentally derived independently by Gotthilf Heinrich Ludwig Hagen in 1839 and Jean Léonard Marie Poiseuille in 1838, and published by Poiseuille in 1840 and 1846.

The assumptions of the equation are that the fluid is incompressible and Newtonian; the flow is laminar through a pipe of constant circular cross-section that is substantially longer than its diameter; and there is no acceleration of fluid in the pipe. For velocities and pipe diameters above a threshold, actual fluid flow is not laminar but turbulent, leading to larger pressure drops than calculated by the Hagen–Poiseuille equation.

Equation

Standard fluid dynamics notation

In standard fluid dynamics notation:

$\Delta P={\frac {8\mu LQ}{\pi r^{4}}}$

or

$\Delta P={\frac {128\mu LQ}{\pi d^{4}}}$

where:

$\Delta P$ is the pressure loss

$L$ is the length of pipe

$\mu$ is the dynamic viscosity

$Q$ is the volumetric flow rate

$r$ is the radius

$d$ is the diameter

$\pi$ is the mathematical constant Pi

Physics notation

$\Phi ={\frac {dV}{dt}}=v\pi R^{2}={\frac {\pi R^{4}}{8\eta }}\left({\frac {-\Delta P}{\Delta x}}\right)={\frac {\pi R^{4}}{8\eta }}{\frac {|\Delta P|}{L}}$

where in compatible units (e.g., S.I.):

$\Phi$ is the volumetric flow rate (denoted as $Q$ above)

$V(t)$ is the volume of the liquid transferred as a function of time, $t$

$v$ is mean fluid velocity along the length of the tube

$x$ is distance in direction of flow

$R$ is the internal radius of the tube

$\Delta P$ is the pressure difference between the two ends

$\eta$ is the dynamic fluid viscosity (S.I. unit: pascal-second (Pa·s)),

$L$ is the length of the tube

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The equation fails in the limit of low viscosity, wide and/or short pipe. Low viscosity or a wide pipe may result in turbulent flow, making it necessary to use more complex models, such as Darcy-Weisbach equation. If the pipe is too short, the Hagen–Poiseuille equation may result in unphysically high flow rates; the flow is bounded by Bernoulli's principle, under less restrictive conditions, by

$\Phi _{max}=\pi R^{2}{\sqrt {2\Delta P/\rho }}$.

Relation to Darcy–Weisbach

Normally, Hagen-Poiseuille flow implies not just the relation for the pressure drop, above, but also the full solution for the laminar flow profile, which is parabolic. However, the result for the pressure drop can be extended to turbulent flow by inferring an effective turbulent viscosity in the case of turbulent flow, even though the flow profile in turbulent flow is strictly speaking not actually parabolic. In both cases, laminar or turbulent, the pressure drop is related to the stress at the wall, which determines the so-called friction factor. The wall stress can be determined phenomenological Darcy–Weisbach equation in the field of hydraulics, given a relationship for the friction factor in terms of the Reynolds number. In the case of laminar flow:

$\Lambda ={64 \over {\it {\mathrm {Re} }}}\;,\quad \quad \mathrm {Re} ={2\rho vr \over \eta }\;,$

where Re is the Reynolds number and ρ fluid density. Note that v is the mean flow velocity, which is half the maximum flow velocity in the case of laminar flow. It proves more useful to define the Reynolds number in terms of the mean flow velocity because this quantity remains well-defined even in the case of turbulent flow, whereas the maximum flow velocity may not be - or in any case, it may be difficult to infer. In this form the law approximates the Darcy friction factor, the energy (head) loss factor, friction loss factor or Darcy (friction) factor Λ in the laminar flow at very low velocities in cylindrical tube. The theoretical derivation of a slightly different form of the law was made independently by Wiedman in 1856 and Neumann and E. Hagenbach in 1858 (1859, 1860). Hagenbach was the first who called this law the Poiseuille's law.

The law is also very important specially in hemorheology and hemodynamics, both fields of physiology.

The Poiseuilles' law was later in 1891 extended to turbulent flow by L. R. Wilberforce, based on Hagenbach's work.

Derivation

Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church. The Hagen–Poiseuille equation can be derived from the Navier–Stokes equations. Although more lengthy than directly using the Navier–Stokes equations, an alternative method of deriving the Hagen–Poiseuille equation is as follows.

Liquid flow through a pipe

a) A tube showing the imaginary lamina. b) A cross section of the tube shows the lamina moving at different speeds. Those closest to the edge of the tube are moving slowly while those near the center are moving quickly.

Assume the liquid exhibits Laminar flow. Laminar flow in a round pipe prescribes that there are a bunch of circular layers (lamina) of liquid, each having a velocity determined only by their radial distance from the center of the tube. Also assume the center is moving fastest while the liquid touching the walls of the tube is stationary (due to the no-slip condition).

To figure out the motion of the liquid, all forces acting on each lamina must be known:

1. The pressure force pushing the liquid through the tube is the change in pressure multiplied by the area: $F=-\Delta PA$. This force is in the direction of the motion of the liquid. The negative sign comes from the conventional way we define $\Delta P=P_{end}-P_{top}<0$.
2. Viscosity effects will pull from the faster lamina immediately closer to the center of the tube.
3. Viscosity effects will drag from the slower lamina immediately closer to the walls of the tube.

Viscosity

Two fluids moving past each other in the x direction. The liquid on top is moving faster and will be pulled in the negative direction by the bottom liquid while the bottom liquid will be pulled in the positive direction by the top liquid.

When two layers of liquid in contact with each other move at different speeds, there will be a shear force between them. This force is proportional to the area of contact A, the velocity gradient in the direction of flow ${\Delta v_{x}}/{\Delta y}$, and a proportionality constant η (viscosity) and is given by

$F_{\text{viscosity, top}}=-\eta A{\frac {\Delta v_{x}}{\Delta y}}.$

The negative sign is in there because we are concerned with the faster moving liquid (top in figure), which is being slowed by the slower liquid (bottom in figure). By Newton's third law of motion, the force on the slower liquid is equal and opposite (no negative sign) to the force on the faster liquid. This equation assumes that the area of contact is so large that we can ignore any effects from the edges and that the fluids behave as Newtonian fluids.

Faster lamina

Assume that we are figuring out the force on the lamina with radius $s$. From the equation above, we need to know the area of contact and the velocity gradient. Think of the lamina as a ring of radius $r$, thickness $dr$, and length Δx. The area of contact between the lamina and the faster one is simply the area of the inside of the cylinder: $A=2\pi r\Delta x$ . We don't know the exact form for the velocity of the liquid within the tube yet, but we do know (from our assumption above) that it is dependent on the radius. Therefore, the velocity gradient is the change of the velocity with respect to the change in the radius at the intersection of these two laminae. That intersection is at a radius of $r$. So, considering that this force will be positive with respect to the movement of the liquid (but the derivative of the velocity is negative), the final form of the equation becomes

$F_{\text{viscosity, fast}}=-\eta 2\pi r\Delta x\left.{\frac {dv}{dr}}\right\vert _{r}$

where the vertical bar and subscript r following the derivative indicates that it should be taken at a radius of $r$.

Slower lamina

Next let's find the force of drag from the slower lamina. We need to calculate the same values that we did for the force from the faster lamina. In this case, the area of contact is at r+dr instead of r. Also, we need to remember that this force opposes the direction of movement of the liquid and will therefore be negative (and that the derivative of the velocity is negative).

$F_{\text{viscosity, slow}}=\eta 2\pi (r+dr)\Delta x\left.{\frac {dv}{dr}}\right\vert _{r+dr}$

Putting it all together

To find the solution for the flow of liquid through a tube, we need to make one last assumption. There is no acceleration of liquid in the pipe, and by Newton's first law, there is no net force. If there is no net force then we can add all of the forces together to get zero

$0=F_{\text{pressure}}+F_{\text{viscosity, fast}}+F_{\text{viscosity, slow}}$

or

$0=-\Delta P2\pi rdr-\eta 2\pi r\Delta x\left.{\frac {dv}{dr}}\right\vert _{r}+\eta 2\pi (r+dr)\Delta x\left.{\frac {dv}{dr}}\right\vert _{r+dr}.$

First, to get everything happening at the same point, use the first two terms of a Taylor series expansion of the velocity gradient:

$\left.{\frac {dv}{dr}}\right\vert _{r+dr}=\left.{\frac {dv}{dr}}\right\vert _{r}+\left.{\frac {d^{2}v}{dr^{2}}}\right\vert _{r}dr.$

The expression is valid for all laminae. Grouping like terms and dropping the vertical bar since all derivatives are assumed to be at radius r,

$0=-\Delta P2\pi rdr+\eta 2\pi dr\Delta x{\frac {dv}{dr}}+\eta 2\pi rdr\Delta x{\frac {d^{2}v}{dr^{2}}}+\eta 2\pi (dr)^{2}\Delta x{\frac {d^{2}v}{dr^{2}}}.$

Finally, put this expression in the form of a differential equation, dropping the term quadratic in dr.

${\frac {1}{\eta }}{\frac {\Delta P}{\Delta x}}={\frac {d^{2}v}{dr^{2}}}+{\frac {1}{r}}{\frac {dv}{dr}}$

It can be seen that both sides of the equations are negative: there is a drop of pressure along the tube (left side) and both first and second derivatives of the velocity are negative (velocity has a maximum value at the center of the tube, where r = 0). Using the chain rule, the equation may be re-arranged to:

${\frac {1}{\eta }}{\frac {\Delta P}{\Delta x}}={\frac {1}{r}}{\frac {d}{dr}}r{\frac {dv}{dr}}.$

This differential equation is subject to the following boundary conditions:

$v(r)=0$ at $r=R$ -- "no-slip" boundary condition at the wall

${\frac {dv}{dr}}=0$ at $r=0$ -- axial symmetry.

Axial symmetry means that the velocity v(r) is maximum at the center of the tube, therefore the first derivative ${\frac {dv}{dr}}$ is zero at r = 0.

The differential equation can be integrated to:

$v(r)={\frac {1}{4\eta }}r^{2}{\frac {\Delta P}{\Delta x}}+A\ln(r)+B.$

To find A and B, we use the boundary conditions.

First, the symmetry boundary condition indicates:

${\frac {dv}{dr}}={\frac {1}{2\eta }}r{\frac {\Delta P}{\Delta x}}+A{\frac {1}{r}}=0$ at r = 0.

A solution possible only if A = 0. Next the no-slip boundary condition is applied to the remaining equation:

$v(R)={\frac {1}{4\eta }}R^{2}{\frac {\Delta P}{\Delta x}}+B=0$

so therefore

$B=-{\frac {1}{4\eta }}R^{2}{\frac {\Delta P}{\Delta x}}.$

Now we have a formula for the velocity of liquid moving through the tube as a function of the distance from the center of the tube

$v=-{\frac {1}{4\eta }}{\frac {\Delta P}{\Delta x}}(R^{2}-r^{2})$

or, at the center of the tube where the liquid is moving fastest (r = 0) with R being the radius of the tube,

$v_{max}=-{\frac {1}{4\eta }}{\frac {\Delta P}{\Delta x}}R^{2}.$

Poiseuille's Law

To get the total volume that flows through the tube, we need to add up the contributions from each lamina. To calculate the flow through each lamina, we multiply the velocity (from above) and the area of the lamina.

$\Phi (r)dr={\frac {1}{4\eta }}{\frac {|\Delta P|}{\Delta x}}(R^{2}-r^{2})2\pi rdr={\frac {\pi }{2\eta }}{\frac {|\Delta P|}{\Delta x}}(rR^{2}-r^{3})dr$

Finally, we integrate over all lamina via the radius variable r.

$\Phi ={\frac {\pi }{2\eta }}{\frac {|\Delta P|}{\Delta x}}\int _{0}^{R}(rR^{2}-r^{3})\,dr={\frac {|\Delta P|\pi R^{4}}{8\eta \Delta x}}$

Poiseuille's equation for compressible fluids

For a compressible fluid in a tube the volumetric flow rate and the linear velocity is not constant along the tube. The flow is usually expressed at outlet pressure. As fluid is compressed or expands, work is done and the fluid is heated and cooled. This means that the flow rate depends on the heat transfer to and from the fluid. For an ideal gas in the isothermal case, where the temperature of the fluid is permitted to equilibrate with its surroundings, and when the pressure difference between ends of the pipe is small, the volumetric flow rate at the pipe outlet is given by

$\Phi ={\frac {dV}{dt}}=v\pi R^{2}={\frac {\pi R^{4}\left(P_{i}-P_{o}\right)}{8\eta L}}\times {\frac {P_{i}+P_{o}}{2P_{o}}}={\frac {\pi R^{4}}{16\eta L}}\left({\frac {P_{i}^{2}-P_{o}^{2}}{P_{o}}}\right)$

where:

$P_{i}$ inlet pressure

$P_{o}$ outlet pressure

$L$ is the length of tube

$\eta$ is the viscosity

$R$ is the radius

$V$ is the volume of the fluid at outlet pressure

$v$ is the velocity of the fluid at outlet pressure

This is usually a good approximation when the flow velocity is less than mach 0.3

This equation can be seen as Poiseuille's law with an extra correction factor ${\frac {P_{i}+P_{o}}{2}}\times {\frac {1}{P_{o}}}$ expressing the average pressure relative to the outlet pressure.

Electrical circuits analogy

Electricity was originally understood to be a kind of fluid. This hydraulic analogy is still conceptually useful for understanding circuits. This analogy is also used to study the frequency response of fluid mechanical networks using circuit tools, in which case the fluid network is termed a hydraulic circuit.

Poiseuille's law corresponds to Ohm's law for electrical circuits ($V=IR$), where the pressure drop $\Delta P$ is analogous to the voltage $V$ and volumetric flow rate $\Phi$ is analogous to the current $I$. Then the resistance

$R={\frac {8\eta \Delta x}{\pi r^{4}}}.$

This concept is useful because the effective resistance in a tube is inversely proportional to the fourth power of the radius. This means that halving the radius of the tube increases the resistance to fluid movement by a factor of 16.

Both Ohm's law and Poiseuille's law illustrate transport phenomena.

See also

• Darcy's law
• Pulse
• Wave
• Hydraulic circuit

Notes

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

References

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  In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
  
  Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
  
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  A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
  
  The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
  
  There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang.
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• One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting
  
  In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
  
  Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
  
  Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
  
  A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
  
  The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
  
  There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang.

External links

• Poiseuille's law for power-law non-Newtonian fluid
• Poiseuille's law in a slightly tapered tube