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ICLO-21 Air flows over a cylinder with circular cross section that has an outer diameter of...
A long horizontal cylinder with diameter of d-60 mm and length of L-1 m is at 27°C and is placed ...
A long horizontal cylinder with diameter of d-60 mm and length of L-1 m is at 27°C and is placed in a quiescent environment at 4°C. Find the cooling rate (q). End effects (heat transfer from the two ends of the cylinder) are negligible. The following relation (Churchill and Chu) for Nusselt number can be used. Air (T-288.5K): v=14.87x10° m2/s, k=0.0254 w/m-K, α=21.0x10-6 m2/s, Pr-0.71, B-3.47x1031/K. 1. Quiescent air 7,-4°C 0.06 m diameter T 27 C L=1m MUD 10.60 +...
Air at 20°C and 1 atm flows over a long cylinder at 1 m/s. The cylinder...
Air at 20°C and 1 atm flows over a long cylinder at 1 m/s. The cylinder has a diameter of 10mm and its initial temperature is 134°C. If the density, specific heat, and 3 conductivity of the cylinder are 7832 kg/m , 549 J/kg.K, and 49.2 W/m.K, respectively, calculate the temperature on surface of the cylinder after 100 seconds.
Problem 3: (35pts) Atmospheric air enters the heated section of a circular tube at a flow...
Problem 3: (35pts) Atmospheric air enters the heated section of a circular tube at a flow rate of 0.005 kg/s and a temperature of 30°C. The tube is of diameter D =60mm, and fully developed conditions with h = 30W/m2K exist over the entire length of L-4m. Take cp-1015 /kg.K 2 (a) (10pts) For the case of uniform surface heat flux at q"-1000W/m, determine the total heat transfer rate q and the mean temperature of the air leaving the tube...
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...
1. [Ch1-Definition : 2] The hydraulic lift in an auto-repair shop has a cylinder diameter of...
1. [Ch1-Definition : 2] The hydraulic lift in an auto-repair shop has a cylinder diameter of 0.2 m. To what pressure should the hydraulic fluid be pumped to lift 40 kg of piston and 700 kg of a car? 2. [Ch1-Definition : 3] A barometer to measure absolute pressure shows a mercury column height of 725 mm. The temperature is such that the density of the mercury is 13,550 kg/m3 . Find the ambient pressure (Patm). 3. [Ch2-Property : 3]...
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square, in-...
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (N N-20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of s 60 mm and sr 84 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of T,-390 K may be assumed to be maintained as condensation occurs tudy ithin the tubes. (a)...
A long horizontal cylinder with diameter of d-60 mm and length of L-1 m is at 27°C and is placed in a quiescent environment at 4°C. Find the cooling rate (q). End effects (heat transfer from the two ends of the cylinder) are negligible. The following relation (Churchill and Chu) for Nusselt number can be used. Air (T-288.5K): v=14.87x10° m2/s, k=0.0254 w/m-K, α=21.0x10-6 m2/s, Pr-0.71, B-3.47x1031/K. 1. Quiescent air 7,-4°C 0.06 m diameter T 27 C L=1m MUD 10.60 +...
Problem 3: (35pts) Atmospheric air enters the heated section of a circular tube at a flow rate of 0.005 kg/s and a temperature of 30°C. The tube is of diameter D =60mm, and fully developed conditions with h = 30W/m2K exist over the entire length of L-4m. Take cp-1015 /kg.K 2 (a) (10pts) For the case of uniform surface heat flux at q"-1000W/m, determine the total heat transfer rate q and the mean temperature of the air leaving the tube...
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (N N-20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of s 60 mm and sr 84 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of T,-390 K may be assumed to be maintained as condensation occurs tudy ithin the tubes. (a)...
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