A non-dimensional number generally associated with natural convection heat transfer is
A) Grashoff number
B) Nusselt number
C) Weber number
D) Prandtl number
E) Reynold number.
Correct Answer:
Verified
Q15: Thermal diffusivity of a substance is .
A)proportional
Q16: Unit of thermal diffusivity is
A)m2/hr
B)m2/hr°C
C)kcal/m2 hr
D)kcal/m.hr°C
E)kcal/m2 hr°C.
Q17: Thermal conductivity of wood depends on
A)moisture
B)density
C)temperature
D)all of
Q18: In convection heat transfer from hot flue
Q19: Film coefficient is defined as Inside diameter
Q20: Heat conducted througfi unit area and unit
Q21: The rate of energy emission from unit
Q22: Emissivity of a white polished body in
Q23: A grey body is one whose absorptivity
A)varies
Q24: Two balls of same material and finish
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