Air at 20 °C flows with a velocity of 10 m/s along a 4 m flat plate which is maintained at uniform temperature of 100 °C. What is the local heat flux at x = 4 m from the leading edge of the plate? For air: k = 0.025 W/mK, v= 20x106 m²/s, Pr = 0.7
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- Air at 295 K flows at 3 m/s over a flat plate at 390 K. The air properties are as follows: density =1.1 kg/m3, viscosity =18.1×10−6 Pa.s, specific heat capacity =1005 J/kgK, and thermal conductivity =0.024 W/mK. The velocity and temperature profiles are assumed to be linear, giving the local Nusselt number to be Nux = 0.289 Rex1/ 2Pr1/3. The flow will become turbulent at a Reynolds number of 5×105. Assume the width of the plate perpendicular to the air flow is 1 m. At what distance from the leading edge does the flow become turbulent? ________m What is the heat transfer at the point of transition? ___________W What is the total heat transfer along the length of the plate where the flow is laminar? __________WTopic: Heat transfer Completely solve and box the final answer. 1. A 20degC water flows to 50cmx60cm flat plate with velocity of 5.2m/s . The flat plate surface temperature is maintained at 40deg C. The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent?Air at 20 °C flows with a velocity 10 m/s along a 4 m flat plate which is maintained at uniform temperature of 100 °C. What is the local heat flux at haft distance from the leading edge of the plate (at middle of the plate)? For air: k = 0.025 W/mK, v= 20x10-6 m2/s, Pr = 0.7
- Air at 400C flows with a velocity of 7 m/s over a 5m long and 4m wilde surface of a flat plate whose surface temperature is 800C. Find the rate of heat transfer from the laminar flow region of the surface. (For air at 400C , V = 1.702 × 10-5 , pr = 0.7255, K = 0.02662 w/m . K). (a) 1.796 KW (b) 2.543 KW (c) 0.796 KW (d) 2.321 KWAir at Tair= 39 °C having velocity of 10 m/s is forced to flow over a long hexagonal cross sectioned body which has uniform constant surface temperature of Ts=146 °C as shown in the below figure. What is the forced convection heat flux (in W/m2) from the body? (For air use, k= 0.013 W/m.K, Pr= 0.75, kinematic viscosity= 2 x 10- 5 m²/s) Air T₁₂ V= 10 m/s air D= 15 cmAtmospheric air is in parallel flow (u∞ = 10 m/s, T = 15°C) over a flat heater surface that is to be maintained at a temperature of 90°C. The heater surface area is 0.25 m², and the airflow is known to induce a drag force of 0.17 N on the heater. What is the electrical power, in kW, needed to maintain the prescribed surface temperature? Use the modified Reynolds or Chilton-Colburn analogy. Evaluate properties for the air at 325 K. q= i kW
- Air is forced to flow over 15 m long flat plate as shown in the following figure with velocity of 9.9 m/s. What is the local forced convection heat transfer coefficient (in W/m2.K) at X= 3.9 m? (For air use, k= 0.03 W/m.K, Pr= 0.7, v= 1.8 x 10-5 m²/s). Air V X L= 15 m Isothermal surfaceRequired information Water at 20°C is flowing with velocity of 0.89 m/s between two parallel flat plates placed 1 cm apart. Given: The properties of water at 20°C are p= 998.0 kg/m3, µ = 1.002 x 103 kg/m-s and Pr = 7.01 Determine/the distance from the entrance at which the velocity boundary layers meet. (Round the final answer to one decimal place.) The distance from the entrance at which the velocity boundary layers meet is m.A 20degC water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40deg C. The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent? If the average laminar heat transfer coefficient of water is 7740W/m2 degC, what is the overall heat transfer at the laminar section?
- Heat transfers Air at temperature 20 C and pressure 1 atm, flow over a flat plate at 3 m/s. The surface temperature of the plate 60 C and the plate width 30 cm, at distance 30 cm from the leading edge .Take the air properties as following, µ=2.02x10^-5 kg/m.s, k=0.0292 W/m.C, Cp=1.01 kJ/kg.C, : ρ = 1.128 kg/ m3, Pr=0.7. Choose the correct answer:Air at 20 ◦ C flows inside a pipe 18-mm-ID having a uniform heat flux of 150 W/m 2 on the surface, the average flow velocity at entry being 1.0 m/s. The air pressure is 2 bar. Determine the value of convection coefficient. If the pipe is 2.5 m long, determine the air exit temperature and the wall temperature at the exit. Assume fully developed hydrodynamic boundary layer.Water at a temperature of 25oC flows parallel over a flat plate with free-stream velocity of 2 m/s. The plate surface temperature is uniform at 86oC. Calculate: a) Thermal boundary layer thickness at x = 8 cm from leading edge; b) Local heat flux on x = 8 cm from leading edge; c) Total heat transfer rate in the area of plate L = 8 cm from the leading edge and width w = 10 cm.