7-42 C&S In cryogenic equipment, cold air flows in parallel over the surface of a 2-m x 2-m ASTM A240 410S stainless steel plate. The air velocity is 5 m/s at a temperature of -70°C. The minimum temperature suitable for the ASTM A240 410S plate is -30°C (ASME Code for Process Piping, ASME B31.3-2014, Table A-1M). The plate is heated to keep its surface temperature from going below -30°C. Determine the average heat transfer rate required to keep the plate surface from getting below the minimum suitable temperature.

7-42 C&S In cryogenic equipment, cold air flows in parallel over the surface of a 2-m x 2-m ASTM A240 410S stainless steel plate. The air velocity is 5 m/s at a temperature of -70°C. The minimum temperature suitable for the ASTM A240 410S plate is -30°C (ASME Code for Process Piping, ASME B31.3-2014, Table A-1M). The plate is heated to keep its surface temperature from going below -30°C. Determine the average heat transfer rate required to keep the plate surface from getting below the minimum suitable temperature.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.31P

See similar textbooks

Similar questions

What is the physical significant of prandtl number? Question does the value of the prandtl number depend on the type of flow, or the flow geometry? Does the prandtl number of air change with pressure? does it change your temperature?
Please help with this questionHot carbon dioxide exhaust gas at 1 atm is being cooled by flat plates. Thegas at 220°C flow is parallel over the upper and lower surfaces of a 3-m-longflat plate at a velocity of 3 m/s. If the flat plate surface temperature ismaintained at 80°C.Determine the local convection heat transfer coefficient at 1 m fromthe leading edge and calculate the average convection heat transfer coefficient over theentire plate.
Hot carbon dioxide exhaust gas at 1 atm is being cooled by flat plates. The gas at 220oC flows in parallel over the upper and lower surfaces of a 1.5-m-long flat plate at a velocity of 3m/s. if the flat plate surface temperature is maintained at 80oC, determine (a) the local convection heat transfer coefficient at 1 m from the leading edge, (b) the average convection heat transfer coefficient over the entire plate, and (c) the total heat flux transfer to the plate.
Oilflow in a journal bearing can be treated as parallel flow betweentwo large isothermal plates with one plate moving at a constant velocityof 12 m/s and the other stationary. Consider such a flow with a uniformspacing of 0.7 mm between the plates. The temperature of the upperand lower plates are 47°C and 17°C, respectively. By simplifying andsolving the continuity, momentum, and energy equations, determine:(a) thevelocity andtemperature distributionsin the oil.(b ) the maximum temperature and where itoccurs.(The location ofmaximum temperature is determined bysetting dT/dy=0).(c) the heat flux from the oil to each plate
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. Determine the rate of heat transfer per unit width from the plate for values of the critical Reynolds number corresponding to 5×105
During air cooling of oranges, grapefruit, andtangelos, the heat transfer coefficient for combined convection,radiation, and evaporation for air velocities of0.11 < V < 0.33 m/s is determined experimentally and isexpressed as h = 5.05 kair Re1/3/D, where the diameter Dis the characteristic length. Oranges are cooled by refrigeratedair at 5°C and 1 atm at a velocity of 0.3 m/s. Determine(a) the initial rate of heat transfer from a 7-cm-diameterorange initially at 15°C with a thermal conductivity of0.50 W/m·K, (b) the value of the initial temperature gradientinside the orange at the surface, and (c) the value of theNusselt number.
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.
Air at 10oC enters a 10-cm-diameter and 4-m-long pipe at a rate of 0.035 kg/s. The inner surface of the pipe has a roughness of 0.22 mm, and the pipe is nearly isothermal at 60o Determine the rate of heat transfer to air using the Nusselt number relation given by (a) Eq. 8–66 and (b) Eq. 8–71. Evaluate air properties at a bulk mean temperature of 20oC. Is this a good assumption?
Example 2: The local atmospheric pressure in Denver, Colorado (elevation 1610 m), is 83.4 kPa. Air at this pressure is 20°C flows with a velocity of 8 m/s over a 1.5 m  6 m flat plate whose temperature is 140°C (Figure). Determine the rate of heat transfer from the plate if the air flows parallel to the (a) 6-m-long side and (b) the 1.5-m side.
In the effort to increase the removal of heat from a hot surface at 120°C, a cylindrical pin fin (kf = 237 W/m.K) with diameter of 5 mm is attached to the hot surface. Air at 20°C (1 atm) is flowing across the pin fin with a velocity of 10 m/s. Determine the maximum possible rate of heat transfer from the pin fin. Evaluate the air properties at 70°C.
Air at 20°C, 1 atm flows with a velocity of 4.5 m/s over a flat plate having a sharp leading edge. The plate surface isisothermal at 60°C.(a)Find out the distance from leading edge at which the flow in the boundary layer changes from laminar to turbulent.(b)Using exact solution,determinethe following parameters at the location established at part (a):(i)Thickness of the hydrodynamic boundary layer(ii)Thickness of the thermalboundary layer(iii)Local convective heat transfer coefficient(iv)Average convective heat transfer coefficient(v)Heat transfer rate from both sides per unit width of the plate(vi)Mass entrainment in the boundary layer(vii)The skin friction coefficient
What is the function of V-cone flow element and manifold pressure measuring devices, where equipment this can applied and What manufacturing processes may they be found in?