Air at 20°C blows over a hot plate 50 by 75 cm maintained at 250°C. The convection heat-transfer coefficient is 25 W/m². °C. Calculate the heat transfer.
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- Imagine a plate 0.1 m long by 0.1 m wide at a temperature of 80 °C. Water is passed over its surface at a speed of 0.1 m/s and 40°C. Calculate the heat dissipated by the plate. Assume the following properties of water at 60 °C: k= 0.651 W/mK, Pr=3.02 y v = 0.478 x 10-6 m²/s.Q2: Air at standard conditions of I atm and 27°C flows over a flat plate at 20 m/s. The plate is 60 cm square and is maintained at 97°C. Calculate the heat transfer from the plate. Answers: Q= 681 W,Air at 20°C and with I Bar Pressure is flowing over a flat plate at a velocity of 2.801 m/s. If the plate is 27.5 cm wide and at 60°C, calculate the value of Boundary layer thickness, Average friction coefficient, Shear stress due to friction, Local convective heat transfer coefficient, Average heat transfer coefficient, Rate of heat transfer by convection and Total Drag on the plate.The properties at 40°C are:Density: 1.1298 kg/m³, cp= 1.004 kJ/kg C, k- 0.02774 w/m'C, Kinematic viscosity is 17.13 x 10°
- Atmospheric air with free flow velocity U_∞= 30 m/s flows through a circular cylinder at T_∞= 250 K and D = 2.5 cm diameter. The surface of the circular cylinder is kept at a uniform temperature T_w = 350 K.The CD drag coefficient is 1.1. (D=1 cm- 3 cm and U_∞= 10 m/sec 30 m/s)(a) Calculate the average heat transfer coefficient ( h ̅_m,W/m2K)(b) Determine the amount of heat transfer (Q, W) per 1 m length of the cylinder(c) Calculate the drag force (FD, N) acting on the 1 m length of the cylinder FD=0.1 A=0.34 D=2.9 cd=1.2Atmospheric air with free flow velocity U_∞= 30 m/s flows through a circular cylinder at T_∞= 250 K and D = 2.5 cm diameter. The surface of the circular cylinder is kept at a uniform temperature T_w = 350 K. The CD drag coefficient is 1.1. (D=1 cm- 3 cm and U_∞= 10 m/sec 30 m/s)(a) Calculate the average heat transfer coefficient ( h ̅_m,W/m2K)(b) Determine the amount of heat transfer (Q, W) per 1 m length of the cylinder(c) Calculate the drag force (FD, N) acting on the 1 m length of the cylinderFluid flows over a plane surface 1m by 1m with a bulk temperature of 50 °C.The temperature of the surface is 20°C. The convective heat transfercoefficient is 2000 W/m²°C.
- Q2: Explain, motorcycle engine is either considered as free or forced convection. Justify your answer.Oil at 350 K is flowing over a flat plate maintained at 425 K. Tha plate is 0.75 m long and 200 mm wide. The velocity of flow is 0.25 m/s. The properties are evaluated at the mean temperature of 350 deg C. Properties of the oil are v = 50×10^-6 m^2 / s , k = 0.14 W / m - K Pr = 600 , p = 853 kg /m^3. The Nusselt number is most nearly:Oil at 350 K is flowing over a flat plate maintained at 425 K. Tha plate is 0.75 m long and 200 mm wide. The velocity of flow is 0.25 m/s. The properties are evaluated at the mean temperature of 350 deg C. Properties of the oil are v = 50 x 10^-6 m^2/s, k = 0.14 W/m-K, Pr = 600, p = 853 kg/m^3. The Nusselt number is most nearly:
- A 4-m x 4-m flat plate maintained at a constant temperature of 80°C is subjected to parallel flow of air at 1 atm, 20°C, and 10 m/s. The total drag force acting on the upper surface of the plate is measured to be 2.4 N. Using momentum heat transfer analogy, determine the average convection heat transfer coefficient, and the rate of heat transfer between the upper surface of the plate and the airA modern cabin has a concrete floor that is 4.50 inches thick. Aroaring fire keeps the interior of the cabin at 21.0 0C while the airtemperature below the cabin is a chilly 2.00 0C. How much heat(J) is lost through the concrete floor in 4 hrs if the cabin measures4.50 m by 6.50m to 3 sig fig?A 5.0-cm-diameter cylinder is heated to a temperature of 200°C, and air at 30 °C forced across it at a velocity of 50 m/s (h = 180 W/m2 K). If the surface emissivity is 0.7, calculate the total heat loss per unit length if the walls of the enclosing room are at 10 °C. Comment on your calculation.