In forced convection, the heat transfer depends on _______________?
In forced convection, the heat transfer depends on _______________?
A. Re, Pr
B. Re, Gr
C. Mainly Gr
D. Re only
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The equivalent diameter for the annulus of a double pipe heat exchanger, whose inner pipe has fins on the outside is ______________ compared to the same size pipes without fins?
The equivalent diameter for the annulus of a double pipe heat exchanger, whose inner pipe has fins on the outside is ______________ compared to the same size pipes without fins?A. More
B. Less
C. Same
D. UnpredictableThe equation, (NSt × N2/3 Pr) = f/2, is the ____________ analogy ?
The equation, (NSt × N2/3 Pr) = f/2, is the ____________ analogy ?A. Colburn
B. Reynolds
C. Prandtl
D. None of theseWhat is the geometric mean of two heat transfer areas A1 and A2 ?
What is the geometric mean of two heat transfer areas A1 and A2 ?A. √(A1 . A2)
B. √(A1 + A2)
C. ½ √(A1 . A2)
D. 2 √(A1 . A2)The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is______________?
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is______________?A. 1.66
B. 88.66
C. 3.66
D. Dependent on NRe onlyThe Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by_______________?
The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by_______________?A. Forced convection
B. Natural convection
C. Transient conduction
D. Steady state conductionThe Graetz number is concerned with the___________________
The Graetz number is concerned with the___________________A. Mass transfer between a gas and a liquid
B. Absorption with chemical reaction
C. Heat transfer in turbulent flow
D. Heat transfer in laminar flow