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TRUE FALSE of this ctew factors Fia and Fas for the following. Surface 1 is the...
(2 pts) Heat is transferred from a hot fluid (temperature T1 and heat transfer coefficient h2)...
(2 pts) Heat is transferred from a hot fluid (temperature T1 and heat transfer coefficient h2) through a plane wall of thickness 8, surface area A and the thermal conductivity k. The thermal resistance for the set up is + (a) AC ) (b) A (i + + ) (c) 2 (na + + n2) (d) A (na + b +h2) (2 pts) An increase in convective heat transfer coefficient over a fin will (a) increase effectiveness (b) decrease effectiveness...
3. Consider the following fluids at a film temperature of 300 K in parallel flow over...
3. Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate with velocity of 1 m/s: atmospheric air and mercury. a. For each fluid, estimate the velocity and thermal boundary layer thicknesses at a distance of 40 mm from the leading edge. (4 pts for each boundary layer thickness determination. Total 16 pts) At what distance from the leading edge, do the boundary layers of air and mercury transition to turbulence? (5...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50 m/s. The plate is 300 cm long and is maintained at 60C. The width of the plate is 2 m. The critical Rec = 5 x 105 The properties are Conductivity k = 0.0263 W/mK, kinematic viscosity nu = v = 15.89 x 10-6 m²/s, Prandtl number is Pr=0.707 Density rho = p = 1.128 kg/m3 1. Determine the critical length Xc 2. Determine...
Air at T=25°C and pressure P=1 bar flows over a square plate with a velocity V=1...
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...
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...
(2 pts) Heat is transferred from a hot fluid (temperature T1 and heat transfer coefficient h2) through a plane wall of thickness 8, surface area A and the thermal conductivity k. The thermal resistance for the set up is + (a) AC ) (b) A (i + + ) (c) 2 (na + + n2) (d) A (na + b +h2) (2 pts) An increase in convective heat transfer coefficient over a fin will (a) increase effectiveness (b) decrease effectiveness...
3. Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate with velocity of 1 m/s: atmospheric air and mercury. a. For each fluid, estimate the velocity and thermal boundary layer thicknesses at a distance of 40 mm from the leading edge. (4 pts for each boundary layer thickness determination. Total 16 pts) At what distance from the leading edge, do the boundary layers of air and mercury transition to turbulence? (5...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50 m/s. The plate is 300 cm long and is maintained at 60C. The width of the plate is 2 m. The critical Rec = 5 x 105 The properties are Conductivity k = 0.0263 W/mK, kinematic viscosity nu = v = 15.89 x 10-6 m²/s, Prandtl number is Pr=0.707 Density rho = p = 1.128 kg/m3 1. Determine the critical length Xc 2. Determine...
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...
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