Questions from Thermal Fluid Science

Q: Two finned surfaces are identical, except that the convection heat transfer

Two finned surfaces are identical, except that the convection heat transfer coefficient of one of them is twice that of the other. For which finned surface is the (a) fin effectiveness and (b) fin eff...

Q: Obtain a relation for the fin efficiency for a fin of constant

Obtain a relation for the fin efficiency for a fin of constant cross-sectional area Ac, perimeter p, length L, and thermal conductivity k exposed to convection to a medium at T∞ with a heat transfer c...

Q: A 4-mm-diameter and 10-cm-long

A 4-mm-diameter and 10-cm-long aluminum fin (k = 237 W/mâ‹…K) is attached to a surface. If the heat transfer coefficient is 12 W/m2â‹…K, determine the percent error in...

Q: Consider a surface of area A at which the convection and radiation

Consider a surface of area A at which the convection and radiation heat transfer coefficients are hconv and hrad, respectively. Explain how you would determine (a) the single equivalent heat transfer...

Q: Reconsider Prob. 3–52E. Using appropriate software, study

Reconsider Prob. 3–52E. Using appropriate software, study the effects of the unit cost of energy, the new combustion efficiency on the annual energy, and cost savings. Let the efficiency vary from 0.7...

Q: Consider a very long rectangular fin attached to a flat surface such

Consider a very long rectangular fin attached to a flat surface such that the temperature at the end of the fin is essentially that of the surrounding air, i.e., 20°C. Its width is 5.0 cm; thickness i...

Q: Consider a very long, slender rod. One end of the

Consider a very long, slender rod. One end of the rod is attached to a base surface maintained at Tb, while the surface of the rod is exposed to an air temperature of 400°C. Thermocouples i...

Q: Two very long, slender rods of the same diameter and length

Two very long, slender rods of the same diameter and length are given. One rod (Rod 1) is made of aluminum and has a thermal conductivity k1 = 200 W/mâ‹…K, but the thermal conductivity...

Q: A turbine blade made of a metal alloy (k = 17

A turbine blade made of a metal alloy (k = 17 W/mâ‹…K) has a length of 5.3 cm, a perimeter of 11 cm, and a cross sectional area of 5.13 cm2. The turbine blade is exposed to hot gas fro...

Q: Consider a stainless steel spoon (k = 8.7 Btu

Consider a stainless steel spoon (k = 8.7 Btu/h⋅ft⋅°F)partially immersed in boiling water at 200°F in a kitchen at 75°F. The handle...