Air 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 Tair V= 10 m/s D= 15 cm
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- Topic: Heat transfer Completely solve and box the final answer. 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?Consider an airflow over the surface of a flat plate with a temperature Ts = 250 °C. At some distance from y the origin, the temperature profile of the airflow is given by the following function: q/A As, Ts T(y) = T, -(T. -T3)exp -u. y a fluido dAs The airflow at atmospheric pressure has a free flow velocity u.. = 0.06 m/s and a temperature T = 15°C. The thermal diffusivity of the fluid is aluid = 3.872E-05 m?/s and its thermal conductivity Afluid = 0.03383 W/(m K). 1. Determine the heat flux over the surface of the plate. q/A = W/m? 2. Determine the convection coefficient of the airflow. h = W/(m² K)A 20 °C water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40 °C The water flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, What is the local heat flux (Q/A) at the end of the plate (k=0.86 W/m deg C, Re=3840000, and Pr=0.7)?
- A 20 °C water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40 °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 °C , what is the overall heat transfer at the laminar section?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?Consider laminar flow entering a tube. Before the fluid enters, the velocity profile is constant and equal to to. The tube diameter is D and radius R. You are interested in estimating how much distance the fluid must travel into the tube before the classic Poiseuille parabolic velocity profile is established - this distance is called the "entrance length" or Zent- Using boundary layer theory, which of the following would be a reasonable estimate? (Hint: assume as flow enters the tube, you can model the growing viscous boundary layer as laminar flow over a flat plate, and note that the De where v = Reynolds number for a tube is Rep %3D Zent = (Rep) Zent = D 2 (Rep) Zent = 2. Rep - Rep O Zent R-Rep %3D O None of the above.
- Topic: 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?Water (T= 10 C, , k=0.644 W/m.C, u = 5.54× 10^-7 m2/s, Pr=3.55), flow over plate 1m x 1m , with velocity 2 m/s. the plate surfące temperature is 90 C. Give the answer for the following |-the flow tyPe 2-total het transfer 3-theavargeheat transfer cafficient 4- Nu ?A fluid Prandti number Pr=1 at 500K flows over a plate of 2.5 m length, maintained at 300K. The velocity of the fluid is 20m/s. Assuming kinematic viscosity v= 20*10^-6 m2/s. Determine the thermal boundary layer thickness at 0.6 m from the leading edge ?
- Explain the physical significance of the Nusselt. Calculate the Nusselt numbers for the following: A gas flow (Prandtl number, Pr = 0.71, dynamic viscosity, μ = 4.63 x 10-5. and kg ms specific heat, Cp = 1.175 kJ/kgK) over a turbine blade of chord length 20 mm, where the average heat transfer coefficient is 1000 W/m².K.An isothermal long cylinder with square (side of 0.4 m and diagonal of 0.5657 m) cross-section is placed in a flow with a velocity of 1 m/s as shown. The properties of the fluid are: kinematic viscosity is 1.38 x 10-5 m²/s, thermal conductivity is 0.024 W/m.°C, and Prandtl number is 0.73. What is the average Nusselt number for the flow? 1253 a Figure 1: Flow configuration for Problem 6. The dimensions are: a=0.4 m, b=0.5657 mEngine oil at 100°C flows on the top surface of a 1-m-long flat plate maintained at 20°C. The oil’s freestream speed (u infinity) is 0.1 m/s. Find the engine oil properties from the table A.5 A. Evaluate the Reynolds number, local convection coefficient, heat flux and shear stress at the end of the plate (x = L). Is the air flow laminar or turbulent over the plate?B. Evaluate the average convection coefficient, average heat flux, average shear stress and drag force over the plate.