Experiments have been conducted to determine local heat transfer coefficients for flow perpendicular to a long, isothermal bar of rectangular cross section. The bar is of width c parallel to the flow, and height d normal to the flow. For Reynolds numbers in the range 104 Red ≤ 5×104, the face-averaged Nusselt numbers are well correlated by an expression of the form Nud = hd/k = C Rem Pr. 1/3 The values of C and m for the front face, side faces, and back face of the rectangular rod are found to be the following: Face cld C m Front 0.33 cld 1.33 0.674 1/2 Side 0.33 0.153 2/3 Side 1.33 0.107 2/3 Back 0.33 0.174 2/3 Back 1.33 0.153 2/3 Determine the value of the average heat transfer coefficient for the entire exposed surface (that is, averaged over all four faces) of ac = 40-mm-wide, d = 30-mm-tall rectangular rod. The rod is exposed to air in cross flow at V = 16 m/s, T = 300 K.
Experiments have been conducted to determine local heat transfer coefficients for flow perpendicular to a long, isothermal bar of rectangular cross section. The bar is of width c parallel to the flow, and height d normal to the flow. For Reynolds numbers in the range 104 Red ≤ 5×104, the face-averaged Nusselt numbers are well correlated by an expression of the form Nud = hd/k = C Rem Pr. 1/3 The values of C and m for the front face, side faces, and back face of the rectangular rod are found to be the following: Face cld C m Front 0.33 cld 1.33 0.674 1/2 Side 0.33 0.153 2/3 Side 1.33 0.107 2/3 Back 0.33 0.174 2/3 Back 1.33 0.153 2/3 Determine the value of the average heat transfer coefficient for the entire exposed surface (that is, averaged over all four faces) of ac = 40-mm-wide, d = 30-mm-tall rectangular rod. The rod is exposed to air in cross flow at V = 16 m/s, T = 300 K.
Elements Of Electromagnetics
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Parvinbhai

Transcribed Image Text:Experiments have been conducted to
determine local heat transfer coefficients for
flow perpendicular to a long, isothermal bar of
rectangular cross section. The bar is of width c
parallel to the flow, and height d normal to the
flow. For Reynolds numbers in the range 104
Red 5×104, the face-averaged Nusselt
numbers are well correlated by an expression
of the form
Nud = hd/k =
C Rem Pp. 1/3
The values of C and m for the front face, side
faces, and back face of the rectangular rod are
found to be the following:
Face
cld
C
m
Front
0.33 cld 1.33
0.674
1/2
Side
0.33
0.153
2/3
Side
1.33
0.107
2/3
Back
0.33
0.174
2/3
Back
1.33
0.153
2/3
Determine the value of the average heat
transfer coefficient for the entire exposed
surface (that is, averaged over all four faces) of
ac = 40-mm-wide, d = 30-mm-tall
rectangular rod. The rod is exposed to air in
cross flow at V = 16 m/s, To
= 300 K.
Physical Properties Mathematical Functions
Step 1
What is the value of the kinematic
viscosity of air at 300 K, in m²/s?
v =
i
m²/s
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