#127 For the one-dimensional fluid-flow problem with velocity known
For the one-dimensional fluid-flow problem with velocity known - Mechanical Engineering
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For the one-dimensional fluid-flow problem (Figure P14â4) with velocity known at the right end, determine the velocities and the volumetric flow rates at nodes 1 and 2. Let Kxx = 2 cm/s.For More Chemistry Notes and Helpful Content Subscribe Our YouTube Chanel - Chemistry Explain
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The following figure represents one-dimensional flow through the porous media:
From the preceding figure the following is the element stiffness matrix for the element-1:
â¦â¦ (1)
Here is the permeability of the porous medium of element 1,is length of the element andis area of the element.
Substitute for,forandforin the equation (1):
â¦â¦ (1)
Here is the permeability of the porous medium of element 1,is length of the element andis area of the element.
Substitute for,forandforin the equation (1):
From the preceding figure the following is the element stiffness matrix for the element-2:
â¦â¦ (2)
Here is the permeability of the porous medium of element 2,is length of the element andis area of the element.
Substitute for,forandforin the equation (2):
â¦â¦ (2)
Here is the permeability of the porous medium of element 2,is length of the element andis area of the element.
Substitute for,forandforin the equation (2):
Calculate the global Stiffness matrix by using the following formula:
â¦â¦ (3)
â¦â¦ (3)
The following matrix is the global nodal potential:
â¦â¦ (4)
â¦â¦ (4)
The following matrix is the force matrix:
â¦â¦ (5)
â¦â¦ (5)
Calculate the elemental force of the element-1 by using the following formula:
â¦â¦ (6)
Here is velocity flow rate andis area of the element.
Substituteforandfor equation (6):
The elemental velocity at the remaining elements 1 and 2 is equal to zero.
The following are the potential boundary conditions:
The potential of element 1 is of the following:
â¦â¦ (6)
Here is velocity flow rate andis area of the element.
Substituteforandfor equation (6):
The elemental velocity at the remaining elements 1 and 2 is equal to zero.
The following are the potential boundary conditions:
The potential of element 1 is of the following:
On applying the boundary conditions, the assembly of the element stiffness matrices produces the following system of equations:
In order find the potentials of elements 2 and 3 the preceding matrix form is reduced to the following form:
In order find the potentials of elements 2 and 3 the preceding matrix form is reduced to the following form:
The preceding matrix form can be written in the equation form is of the following:
â¦â¦ (7)
By solving the preceding equations, the following the potential at element 2 and 3 values were obtained:
And.
â¦â¦ (7)
By solving the preceding equations, the following the potential at element 2 and 3 values were obtained:
And.
Calculate the velocity of element 1 by using the following formula:
â¦â¦ (8)
Substitute for,for,forand forin the equation (8):
Thus, the velocity of fluid at the element-1 is
â¦â¦ (8)
Substitute for,for,forand forin the equation (8):
Thus, the velocity of fluid at the element-1 is
Calculate the velocity of element 2 by using the following formula:
â¦â¦ (9)
Substitute for,for,forand forin the equation (9):
Thus, the velocity of fluid at the element-2 is
â¦â¦ (9)
Substitute for,for,forand forin the equation (9):
Thus, the velocity of fluid at the element-2 is
Calculate the volumetric flow rate by using the following formula:
â¦â¦ (10)
Substituteforandforin the equation (10):
Thus, the volume flow rate of fluid at element-1 is.
â¦â¦ (10)
Substituteforandforin the equation (10):
Thus, the volume flow rate of fluid at element-1 is.
Calculate the volumetric flow rate by using the following formula:
â¦â¦ (11)
Substituteforandforin the equation (11):
Thus, the volume flow rate of fluid at element-2 is.
â¦â¦ (11)
Substituteforandforin the equation (11):
Thus, the volume flow rate of fluid at element-2 is.
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