Ice slurry is being transported in a pipe ( k = 15 W/m .K, D i =2 .5 cm, D o =3 cm and L= 5 m) and with an iliner surface temperature of 0°C. The ambient condition surrounding the pipe has a temperature of 20°C, a convection heat transfer coefficient of 10 V1in2K, and a dew point of 10°C. If the outer surface temperature of the pipe drops below the dew point. condensation can occur on the surface. Since this pipe is located in a vicinity of high-voltage devices, water droplets from the condensation can create an electrical hazard. To prevent an electrical accident, the pipe surface needs to be insulated. Detennine the insulation thickness for the pipe using a material with k = 0 .95W/m .K to prevent the outer surface temperature from dropping below the dew point.
Ice slurry is being transported in a pipe ( k = 15 W/m .K, D i =2 .5 cm, D o =3 cm and L= 5 m) and with an iliner surface temperature of 0°C. The ambient condition surrounding the pipe has a temperature of 20°C, a convection heat transfer coefficient of 10 V1in2K, and a dew point of 10°C. If the outer surface temperature of the pipe drops below the dew point. condensation can occur on the surface. Since this pipe is located in a vicinity of high-voltage devices, water droplets from the condensation can create an electrical hazard. To prevent an electrical accident, the pipe surface needs to be insulated. Detennine the insulation thickness for the pipe using a material with k = 0 .95W/m .K to prevent the outer surface temperature from dropping below the dew point.
Solution Summary: The author explains how to calculate the rate of heat transfers from side to side the wall.
Ice slurry is being transported in a pipe
(
k
=
15
W/m
.K,
D
i
=2
.5 cm, D
o
=3 cm and L= 5 m)
and with an iliner surface temperature of 0°C. The ambient condition surrounding the pipe has a temperature of 20°C, a convection heat transfer coefficient of 10 V1in2K, and a dew point of 10°C. If the outer surface temperature of the pipe drops below the dew point. condensation can occur on the surface. Since this pipe is located in a vicinity of high-voltage devices, water droplets from the condensation can create an electrical hazard. To prevent an electrical accident, the pipe surface needs to be insulated. Detennine the insulation thickness for the pipe using a material with
k = 0
.95W/m
.K
to prevent the outer surface temperature from dropping below the dew point.
Air is flowing in parallel over the upper surface of a flat plate with a length of 4 m. The first half of the plate length, from the leading edge, has a constant surface temperature of 50°C. The second half of the plate length is subjected to a uniform heat flux of 86 W/m2. The air has a free stream velocity and temperature of 0.5 m/s and 10°C respectively. The properties of air at Tf = 30°C are k = 0.02588 W/m∙K, ν = 1.608 × 10−5 m2/s, and Pr = 0.7282. Determine the local convection heat transfer coefficients at 1 m and 3 m from the leading edge.
How can we use the transient temperature charts when the surface temperature of the geometry is specified instead of the temperature of the surrounding medium and the convection heat transfer coefficient?
A heating system is to be designed to keep the wings of an aircraft cruising at a veloeity of 900 km/h above freezing temperatures during flight at 12.200-m altitude where the standard atmospheric conditions are -55.4°C and 188 kPa. Approximating the wing as a cylinder of elliptical cross section whose minor axis is 30 cm and disregarding radiation, determine the average convection heat transfer coefficient on the wing surface and the average rate of heat transfer per unit surface area.
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