A pin fin of uniform cross-sectional area is made out of an alloy with a thermal conductivity of 160 W/ሺm ∙ Kሻ . The fin diameter is 4 mm and it loses heat by convection to the ambient characterized by a convective heat transfer coefficient of 220 W/ሺmଶ ∙ Kሻ. It is found that the fin efficiency is 0.65. Determine: a. The fin length b. The fin effectiveness (Account for tip convection)

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.