List of top Fluid Mechanics and Thermal Sciences Questions

A hot steel spherical ball is suddenly dipped into a low temperature oil bath. Which of the following dimensionless parameters are required to determine the instantaneous center temperature of the ball using a Heisler chart?

An infinitely long pin fin, attached to an isothermal hot surface, transfers heat at a steady rate of \( \dot{Q}_1 \) to the ambient air. If the thermal conductivity of the fin material is doubled, while keeping everything else constant, the rate of steady-state heat transfer from the fin becomes \( \dot{Q}_2 \). The ratio \( \dot{Q}_2 / \dot{Q}_1 \) is

The relative humidity of ambient air at 300 K is 50% with a partial pressure of water vapor equal to \( p_v \). The saturation pressure of water at 300 K is \( p_{sat} \). The correct relation for the air-water mixture is

A linear spring mass-dashpot system with a mass of 2 kg is set in motion with viscous damping. If the natural frequency is 15 Hz, and the amplitude of two successive cycles measured are 7.75 mm and 7.20 mm, the coefficient of viscous damping in (N.s/m) is

Tmin=300 K,Tmax=1200K,Q=1200 KJ.Find work done.