Consider steady, laminar, two-dimensional flow over a hot plate. Does the convective heat transfer coefficient (h) increase, decrease, or remain constant with distance from the leading edge? Explain.
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Consider steady, laminar, two-dimensional flow over a hot plate. Does the convective heat transfer coefficient (h) increase, decrease, or remain constant with distance from the leading edge? Explain.
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- 5.7 The average Reynolds number for air passing in turbulent flow over a 2-m-long, flat plate is . Under these conditions, the average Nusselt number was found to be equal to 4150. Determine the average heat transfer coefficient for an oil having thermal properties similar to those in Appendix 2, Table 18, at at the same Reynolds number and flowing over the same plate.What are the differences between velocity boundary layer and thermal boundary layer? Discuss about both boundary layers including the characteristics, the profiles and factors affecting the boundary layers.Hot carbon dioxide exhaust gas at 1 atm is being cooled by flat plates as shown in Fig 3. The gas at 220°C flows in parallel over the upper and lower surfaces of a 2-m-long flat plate at a velocity of 2 m/s. If the flat plate srface temperature is maintained at 80°C, de termine the local convection heat transfer coefficient at 1 m from the leading edge, the average convection heat transfer rate over the e ntire plate, and the total heat flux transfer to the plate. 11. 111. COo, T. Fig 3
- Engine Oil at 58.95 degrees celsius Flows over a 5m long flat plate whose temperature is 20.11 degrees celsius with a velocity of 2.2m/s. Determine the rate of heat transfer (W), considering forced convection, per unit width of the entire plate. Density = 876kg/m^3 Thermal conductivity = 0.144W/m-K Pr = 2870 dynamic viscosity = 0.21kg/m-s Q = ?Consider oil flowing along with a flat plate parallelly. The oil flow creates laminar velocity and thermal boundary layers because the oil temperature and plate temperature are different. In general, which boundary layer of the oil is thicker, (1) velocity boundary layer or (2) thermal boundary layer? Answer (1) or (2).The average Nusselt number in laminar natural convection from a vertical wall at 180°℃ with still air at 20°C is found to be 48. If the wall temperature becomes 30°C, all other parameters remaining same the average Nusselt number will be (a) 8 (c) 24 (b) 16 (d) 32
- Consider a hot rectangular plate positioned vertically at constant temperature Ts in quiescent air. Sketch the hydrodynamic and thermal boundary layers for three cases (1) Pr>1. Show the velocity and temperature profiles inside boundary layers.Caster oil at 36°C flows over a 6 m long and 1 m wide heated plate at 0.06 m/s. For a surface temperature of 96°C, determine (i) The thermal boundary layer thickness at the end of the plate (ii) The local heat transfer coefficient at the end of the plate.Air at 1 atm is flowing at a velocity of 2.2 m/s across a flat plate. The film temperature between the plate and the air is 300 K. What is the Stanton number at this condition if the convection coefficient is 71.4 W/m² K?
- Reconsider Prob. 9-20. Using the EES (or other) software, evaluate the effect of the plate thickness on the surface temperature exposed to the cold air. By varying the plate thickness from 0.01 to 0.1 m, plot the plate surface temperature on the cold air side as a function of the plate thickness. Prob A 0.2-m-long and 25-mm-thick vertical plate (k = 1.5 W/m∙K) separates the hot water from the cold air at 2°C. The plate surface exposed to the hot water has a temperature of 100°C, and the surface exposed to the cold air has an emissivity of 0.73. Determine the temperature of the plate surface exposed to the cold air (Ts,c).Hot engine oil at 150°C is flowing in parallel over a flat plate at a velocity of 2 m/s. Surface temperature of the 0.5-mlong flat plate is constant at 50°C. Determine (a) the local convection heat transfer coefficient at 0.2 m from the leading edge and the average convection heat transfer coefficient, and (b) repeat part (a) using the Churchill and Ozoe (1973) relation.Oil flow in a journal bearing can be treated as parallel flow between two large isothermal plates with one plate moving at a constant velocity of 8 m/s and the other stationary. Consider such a flow with a uniform spacing of 0.7 mm between the plates. The temperatures of the upper and lower plates are 40°C and 15°C, respectively. By simplifying and solving the continuity, momentum, and energy equations, determine (a) the velocity and temperature distributions in the oil, (b) the maximum temperature and where it occurs, and (c) the heat flux from the oil to each plate.