Question

For fully developed laminar flow of a fluid flowing inside a circular tube, one would expect the largest local convection heat transfer coefficient for a given fluid and tube diameter, when

• A. The same heat flux is maintained on the surface
• B. The same temperature is maintained on the surface
• C. Reynold's number is high
• D. Reynold's number is low

Answer 1

The correct option is A The same heat flux is maintained on the surface

Nu = 4.36 (for constant heat flux condition)
Nu = 3.66 (for constant wall temperature condition)

$(h_x{)}_{const.heatflux}>(h_x{)}_{const.walltemperature}$