Engineering

Engineering, 11.07.2019 01:20, jesuslovesusall3

Can we define the convection resistance for a unit surface area as the inverse of the convection heat transfer coefficient?

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Physics, 09.07.2019 02:10, faithy22

The extent to which the tip condition affects the thermal performance of a fin depends on the fin geometry and thermal conductivity, as well as the convection coefficient. consider an alloyed aluminum (k = 180 w/m*k) rectangular fin of length l = 10 mm, thickness t = 1 mm, and width w > > t. the base temperature of the fin is tb = 100°c, and the fin is exposed to a fluid of temperature t∞ = 25°c. assuming a uniform convection coefficient of h = 100 w/m2*k over the entire fin surface, determine the fin heat transfer rate per unit width qf’, efficiency ηf, effectiveness εf, thermal resistance per unit width r’t,f, and the tip temperature t(l) for the tip conditions: convection heat transfer, adiabatic, and infinitely long.

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Chemistry, 20.08.2019 21:10, HopeBordelon4

Hot air at 80°c is blown over a 2-m by> on0 4-m flat surface at 30°c. if the average? convection heat transfer coefficient varies between 20 w/m2 °c and 100 w/m °c, draw a relation between the rate of heat transfer from the air to the 80°c air 30°c plate.(nm kw) and the convection heat transfer coefficient

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Engineering, 08.10.2019 00:10, tlester2005

Consider a rectangular fin (k=180 w/m·k) of length l=10 mm, thickness t=1 mm, and width w≫t. the base temperature of the fin is tb=110°c, and the fin is exposed to a fluid of temperature [infinity] t[infinity]=25°c. assuming a uniform convection coefficient of h=80 w/m2·k over the entire fin surface, determine the fin heat transfer rate per unit width qf′ ,efficiency ηf, effectiveness εf, thermal resistance per unit width rt,f′and the tip temperature t(l) for convection heat transfer at the tip, adiabatic tip and infinite fin.

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Engineering, 16.10.2019 05:20, itzia00

Acartridge electrical heater is shaped as a cylinder of length l = 300 mm and outer diameter d = 30 mm. under normal operating conditions, the heater dissipates 2 kw while submerged in a water flow that is at 20 c and provides a convection heat transfer coefficient of ° w/m2 h = 5000 k. neglecting heat transfer from the ends of the heater, determine its surface temperature ts and the thermal resistance due to convection. if the water flow is inadvertently terminated while the heater continues to operate, the heater surface is exposed to air that is also at c but for which w/m2 20° h = 50 k. what are the corresponding thermal resistance due to convection and surface temperature? what are the consequences of such an event?

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