Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is

88.66
3.66
1.66
Dependent on NRe only

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Heat Transfer
LMTD for counterflow and prallel flow heat exchanger will be the same, when the

Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid
Outlent temperature of both the hot and cold fluid are same
Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)
None of these

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