Fluid Mechanics Fundamentals And Applications
Fluid Mechanics Fundamentals And Applications
3rd Edition
ISBN: 9780073380322
Author: Yunus Cengel, John Cimbala
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 9, Problem 65P
To determine

The expression for the stream function.

Expert Solution & Answer
Check Mark

Answer to Problem 65P

The stream function is r22(( u z,exit u z,entrance L)×z+(u z,entrance)+C).

Explanation of Solution

Given information:

The velocity component in θ direction is equal to 0.

Write the expression for velocity coordinates along z direction.

  uz=uz,entrance+(u z,exitu z,entranceL)z........... (I)

Write the expression for continuity equation for incompressible flow.

  1r(( r u r )r)+1r(( u θ )θ)+(uz)z=0........... (II)

Here, the change in distance along r direction is r, the change in distance along θ direction is θ, the change in distance in z direction is z, the radial velocity component along r direction is ur, the distance along r direction is r, the velocity component along θ direction is uθ and the velocity component along z direction is uz.

Write the expression for the radial velocity component along r direction.

  ur=1r( ψ z)ψz=rur............ (III)

Here, the partial derivative of the stream function with respect to the change in distance along z direction is ψz.

Write the expression for velocity coordinates along z direction.

  uz=1r( ψ r)ψr=rur............ (IV)

Here, the partial derivative of the stream function with respect to the change in distance along r direction is ψz.

Calculation:

Substitute uz,entrance+[( u z,exit u z,entranceL)] for uz and 0 for uθ in Equation (II).

  1r( ( r u r ) r)+1r( ( 0 ) θ)+( u z,entrance +[ ( u z,exit u z,entrance L )])z=01r( ( r u r ) r)+0+(0+( u z,exit u z,entrance L ))=01r( ( r u r ) r)+( u z,exit u z,entrance L)=0( ( r u r ) r)=r( u z,exit u z,entrance L)........... (V)

Integrate Equation (II) with respect to r.

   ( r u r ) rdr=r( u z,exit u z,entrance L )drrur=r 1+12( u z,exit u z,entrance L)+g(z)rur=r22( u z,exit u z,entrance L)+g(z)............. (VI)

Here, the constant is g(z).

Substitute 0 for r in Equation (III).

  (0)ur= ( 0 )22( u z,exit u z,entrance L)+g(z)0=0+g(z)g(z)=0

Substitute 0 for g(z) in Equation (III).

  rur=r22( u z,exit u z,entrance L)+0rur=r22( u z,exit u z,entrance L)ur=r2( u z,exit u z,entrance L)............ (VII)

Substitute r2(u z,exitu z,entranceL) for ur in Equation (II).

  ψr=r(r2( u z,exit u z,entrance L ))ψr=r22( u z,exit u z,entrance L)........... (VIII)

Integrate Equation (VII) with respect to z.

   ψ r= r 2 2( u z,exit u z,entrance L )dzψ=r22( u z,exit u z,entrance L)×z0+1+f(r)ψ=r22( u z,exit u z,entrance L)×z+f(r)............ (IX)

Substitute r22(u z,exitu z,entranceL)×z+f(r) for ψ in Equation (III).

  ( r 2 2 ( u z,exit u z,entrance L )×z+f( r ))r=rurur=1r×( r 2 2 ( u z,exit u z,entrance L )×z+f( r ))r........... (X)

Differentiate Equation (X) with respect to r.

  uz=1r×( 2× r 21 2 ( u z,exit u z,entrance L )×z+f( r ))r=1r×r×( u z,exit u z,entrance L )×z+f(r)r=( u z,exit u z,entrance L)×z+1r×f(r)............ (XI)

Here, the constant is f(r).

Equate Equation (XI) with Equation (V).

  ( u z,exit u z,entrance L)×z+1r×f(r)=uz,entrance+( u z,exit u z,entrance L)zuz,entrance=( u z,exit u z,entrance L)z( u z,exit u z,entrance L)z+1r×f(r)uz,entrance=1r×f(r)f(r)=ruz,entrance........... (XII)

Integrate Equation (XII) with respect to r.

  f( r)=r u z,entrancedr=r 1+11+1(u z,entrance)+C=r22(u z,entrance)+C........... (XIII)

Here, the constant is C.

Substitute Equation (XIII) in Equation (IX).

  ψ=r22( u z,exit u z,entrance L)×z+r22(u z,entrance)+C=r22(( u z,exit u z,entrance L )×z+( u z,entrance )+C)

Conclusion:

The stream function is r22(( u z,exit u z,entrance L)×z+(u z,entrance)+C).

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Fluid Mechanics Fundamentals And Applications

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