Consider atmospheric air at 25 °C and a velocity of 25 m/s flowing over BOTH surfaces of a 1-m- long flat plate that is maintained at 125 °C. The width of the plate (into paper direction) is 1 m. Determine the rate of heat transfer if the critical Reynolds number is 5 × 105.
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- A 2-cm diameter, 10-m long tube transports water at an average flow velocity of 8 m/s. The water enters at 20°C and leaves at 30°C. To compute for the Nusselt number of the water flow, what is the exact value of the temperature in °C on which the water properties should be based?What is the Reynolds number of a fluid flowing in a tube with an inside diameter of 2 inches? The viscocity is 1.358 x 10^-5 lb/ft-s and the mass flow rate is 73 lb/h.b) A 0.4-W cylindrical electronic component shown in Figure Q3b with diameter 0.3 cm and length 1.8 cm is mounted on a circuit board is cooled by air flowing across it at a velocity of 150 m/min and temperature is 40 °C. Take the pressure of air 1 atm and the film temperature to be 50 °C, determine the surface temperature of the component. Resistor 0.4 W D= 0.3 cm Figure Q3b
- Air at atmospheric pressure enters a heating duct with dimensions of 3 x 6 in. The air enters the 16 ft long duct with a temperature of 32 fahrenheit, and the duct surface is maintained at 150 fahrenheit. If the air exit temperature is to be 68 fahrenheit, what is the air flow, in lb/hr? (answer in whole number) For air, R = 53.342 ft-lbf/lbm-R, k = 0.173 Btu-in/ft2-hr-F, and cp = 0.24 Btu/lbm-FLUID DYNAMICS Discuss the factors that influence pressure drop due to friction both for laminar flow and for turbulentflow in fluid flow in pipes.A flat plate of width 1 m and length 0.2 m is maintained at a temperature of 32 °C. Water at 22 °C flows across the top of the plate in parallel flow (see diagram below). Determine (a) the average convection heat transfer coefficient, and (b) the convection heat transfer rate from the top of the plate when water has a flow rate of 0.5 m/s. Assume steady-state, and find water properties in the "Given information page". Water w = 1 m L= 0.2 m
- Air at atmospheric pressure enters a heating duct with dimensions of 3 x 6 in. The air enters the 16 ft long duct with a temperature of 32 F, and the duct surface is maintained at 150 F. If the air exit temperature is to be 68 F, what is the air flow, in lb/hr? (answer in whole number) For air, R = 53.342 ft-lbf/lbm-R, k = 0.173 Btu-in/ft2-hr-F, and cp = 0.24 Btu/lbm-Q3) Engine oil at 80°C flows over a flat surface at 40°C for cooling purpose, the flow velocity being 2 m/s. Determine at a distance of 0.4 m from the leading edge the hydrodynamic and thermal boundary layer thickness. Also determine the local and average values of friction and convection coefficients.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)?
- The Reynolds number can be viewed as the ratio of (a) Drag force/Dynamic force (b) Buoyancy force/Viscous force (c) Wall friction force/Viscous force (d) Inertial force/Gravitational force (e) Inertial force/Viscous forceA steam reservoir is covered by a rectangular plate (its length is 1 m and width 2 m). The steam temperature is 95o C, and it is in contact with the plate. Over the outside surface of the plate, water is flowing at a speed of 3 m/sec at a temperature of 25o C. What is the mean Nusselt number over the plate? What is the mean heat transfer convective coefficient over the plate? What is the heat transfer rate to the water?-1/5 A// For laminar flow over a flat plate, the local heat transfer coefficient h, is known to vary as x¹/5, where x is the distance from the leading edge (x =0) of the plate. What is the ratio of the average coefficient between the leading edge and some location x on the plate to the local coefficient at x? for velocity equation u= 2-0.43x+x² Plot the local heat transfer coefficient over a 0.8 cm length(take T-35c) B// Air at 1 atm and 15°C flows through a long rectangular duct 7.5 cm by 15 cm. A 1.8-m section of the duct is maintained at 120°C, and the average air temperature at exit from this section is 65°C. Calculate the airflow rate and the total heat transfer