A thin, flat plate that is
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Fundamentals of Heat and Mass Transfer
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- Air is flowing at a speed of 5 m/sec between two parallel flat plates. The air temperature is 20o C and its pressure is 1 atm. The plates are kept at a constant temperature of 90o C and the distance between them is 60 cm. The plates width is 1 m and their length is 1.5 m. What is the electrical power required to keep the plates at constant temperature?arrow_forwardI need the answer as soon as possiblearrow_forwardWhat’s the correct answer for this please?arrow_forward
- Consider that you are in an area of Seattle where the wind is blowing at 40 km/h with a temperature of 0 ° C. If you can be mathematically modeled as a cylinder with diameter external of 0.3m and height of 1.70 m. Calculate the number of hot dogs that you need to eat to make up for the amount of energy you lose in heat form for an hour. Note 1: Consider that the external temperature of the clothes is kept constant at 25 ° C. Note 2: Consider a 150 kcal hot dog.arrow_forwardTo test the heat transfer for the famous Goodyear blimp, a small-scale prototype is being tested in a wind tunnel. The prototype is a cylinder with 1.2 m diameter and 6 m long. Consider that the wind. is blowing across the cylinder (i.e., perpendicular to the cylinder axis) at a velocity of 6 miles-per-hour 1609 m). Ignore the heat transfer rate from the end areas. The wind temperature is 30°C and the surface temperature is uniform at 40°C. Considering this scenario to be dominated by forced convection, what is the convective heat transfer rate from the prototype cylinder? (1 mile 1707 w =arrow_forwardHelp me pleasearrow_forward
- A thin, flat plate of length L = 1 m seperates two airstreams that are in parallel flow over opposite surfaces of the plate. One airstream has a temperature of T,1=200°C and a velocity of uo,1= 60 m/s, while the other airstream has a temperature of T,2= = 25°C and a velocity 10 m/s. What is the heat flux between the two streams at the mid point of the of u0,2 plate?arrow_forwardKNOWN: Speed and temperature of atmospheric air flowing over a flat plate of prescribed length and temperature. FIND: Rate of heat transfer corresponding to Rex,c = 10°, 5 × 10³ and 106. SCHEMATIC: Air U∞=25m/s Too=25°C p=1atm 个个个 19 -TS=125°C ASSUMPTIONS: (1) Flow over top and bottom surfaces. L=1m PROPERTIES: Table 4-4, Air (T+= 348K, 1 atm): p = 1.00 kg/m³, v = 20.72 x 10 = 0.0299 W/m-K, Pr = 0.700. m /s, karrow_forwardThe forming section of a plastics plant puts out a continuous sheet of plastic that is 1.2 m wide and 2 mm thick at a rate of 18 m/min. The sheet is subjected to airflow at a velocity of 4 m/s on both top and bottom surfaces normal to the direction of motion of the sheet. The width of the air cooling section is such that a fixed point on the plastic sheet passes through that section in 2 s. Using properties of air at 1 atm and 60°C, determine the drag force the air exerts on the plastic sheet in the direction of airflow.arrow_forward
- Air flow at a constant speed (Us = 10 m/s) is forming a two-dimensional incompressible laminar boundary layer along a flat plate The velocity profile inside the boundary layer is given by: =2-² A wind tunnel designer plans to build a two dimensional test section for a low speed wind tunnel. The design specification requires that in the test section the free stream flow must be equal to the air velocity at the entrance of the test section. (Figure Q2). U 30 m/s h₁ = 2²-² x,-0.0 Top wall Bottom wall -300 mm X-300 mm Figure Q2 Assuming the same velocity profile as in equation 1, and by using the momentum integral equation determine how much the bottom and top walls should be displaced at point 2 (x₂ = 300 mm) in order to achieve the design requirement as was stated above. In not more than 30-40 words justify your solution. Equation 1:arrow_forwardConsider two cases involving parallel flow of dry air at V = 3.5 m/s, T = 45°C, and atmospheric pressure over an isothermal plate at T = 20°C. In the first case, Rex.c = 5 × 105, while in the second case the flow is tripped to a turbulent state at x = 0m. At what x -location, in m, are the thermal boundary layer thicknesses of the two cases equal? What are the local heat fluxes, in W/m², at this location for the two cases? x = 9'1'am 9 turb = = i i i m W/m² W/m²arrow_forwardEvaluate the boundary-layer shape factor, H.arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning