1.) A smooth glass plate is in a uniform free-stream where air flows over both sides of the plate. The plate is exposed to a constant surface heat flux. What air velocity must be used to remove 8...
A desiccant is being used to remove water vapor from a stream of air with 90% RH at 50°C. The desiccant is a flat plate with 10.4 and maintains a water activi of 0.04 at the surface exposed to the air stream. The stream of air has velocity of 5m/s moving over the surface in the direction of the 25cm length. The mass diffusivity for water vapor in air is 0.18 x 103 m2/s. Compute the mass flux of water...
A 50 mm thick steel plate (AISI347) has a uniform heat flux applied to its bottom surface by a heater. The heater is in contact with the steel plate, and the interface between the heater and steel has a contact resistance of 2.0 x 10-4 m2*K/W. The top surface of the plate is exposed to surrounding air (T = 20oC, h = 10 W/m2*K) and exchanges radiation with surroundings at Tsur = 10oC. The emissivity of the plate is 0.85....
Air at atmospheric pressure and 20 °C flows over a plate with the surface heat flux specified as 20 WImfor 0 <x < 15 cm 10 W/mo 15 cm. Derive the variation of wall temperature with the distance x from the leading edge in the laminar boundary layer region and evaluate the wall temperature numerically at 30 cm.
Air at 25 °C and 1 atm is flowing over a long flat plate with a velocity of 8 m/s. (a) Determine the distance from the leading edge of the plate where the flow becomes turbulent. (b) What will be the boundary layer thickness at the end of the plate? (c) If the plate is a 2m by 2 m square, what will be the friction drag acting on the plate? Schematic Given ssumptions Find v=8m/s xcr ,FD ,δ@x=L L-2m...
1. A very smooth flat plate of length L-1 m and width b 3 m is immersed parallel to a stream of velocity 2 m/s. For both air and water as the working fluids [5 marks] Show that the flow is completely laminar over the entire plate. a. b. Determine the drag force on one side of the plate. Determine the thicknesses δ, δ*, and θ at the end of the plate (x L). [6 marks] C. For air use,...
Air at T=25°C and pressure P=1 bar flows over a square plate with a velocity V=1 m/s. This plate has a length L= 1 m and it is heated over its entire length; the plate temperature is constant Tp=100°C. The following data are given. For air: dynamic viscosity: mu = 1.9*10–5 kg/(m.s); density: rho = 1.05 kg/m3; conductivity k = 0.03 W/(m K); Specific heat Cp = 1.007 kJ/(kg K); Prandtl number Pr = 0.7 For laminar flow over a...
Question 1 [40 Points] Liquid mercury at 300 K flows over a flat surface at a free stream velocity 0.15 m/s. The flat plate is smooth with a width of 0.25 m and length 0.5 m and is kept at a uniform temperature of 400 K. The flow is parallel to the longer dimension of the plate. Find out: 1. MINIMUM LOCAL convective heat flux, q min and its location (60%) 2. Total convective heat transfer rate, q (40%) Use...