Q1: For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

ANS:B - different

For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are typically different. The wetted perimeter refers to the total length of the surface in contact with the fluid. In the case of heat transfer, the wetted perimeter is the surface area through which heat is transferred from the fluid to the surrounding environment or vice versa. In the context of pressure drop, the wetted perimeter represents the surface area against which the fluid exerts pressure as it flows through the annulus. Since the mechanisms governing heat transfer and pressure drop in a fluid flow are different, the surfaces that contribute to heat transfer (such as the inner and outer walls of the annulus) may not necessarily be the same as those contributing to pressure drop (such as the inner and outer boundaries of the annulus). Therefore, the wetted perimeter for heat transfer and pressure drop are generally different in an annulus flow configuration.