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Heat-Transfer-from-Extended-Surfaces

A centrifugal pump which circulates a hot liquid metal at 500 degree Celsius is driven by a 3600 rpm electric motor. The motor is coupled to pump impeller by a horizontal steel shaft of dia 25 mm. Let us assume motor temperature as 60 degree Celsius with ambient air at 25 degree Celsius, what length of shaft should be specified between motor and pump? It may be presumed that rmal conductivity of shaft material is 35W/m K and that convective film coefficient between steel shaft and ambient air is 15.7W/square m K


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This Chapter Heat-Transfer-from-Extended-Surfaces consists of the following topics

Two rods A and B of the same length and diameter protrude from a surface at 120 degree Celsius and are exposed at air at 25 degree Celsius. The temperatures measured at the end of the rods are 50 degree Celsius and 75 degree Celsius. If thermal conductivity of material A is 20W/ m K, calculate it for B

A centrifugal pump which circulates a hot liquid metal at 500 degree Celsius is driven by a 3600 rpm electric motor. The motor is coupled to pump impeller by a horizontal steel shaft of dia 25 mm. Let us assume motor temperature as 60 degree Celsius with ambient air at 25 degree Celsius, what length of shaft should be specified between motor and pump? It may be presumed that rmal conductivity of shaft material is 35W/m K and that convective film coefficient between steel shaft and ambient air is 15.7W/square m K

A thermocouple junction of spherical form is to be used to measure the temperature of the gas stream. The junction is at 20 degree Celsius and is placed in a gas stream which is at 200 degree Celsius. Make calculations for junction diameter needed for the thermocouple to have thermal time constant of one second. Assume the thermos-physical properties as given below
k = 20 W/ m K
h = 350 W/m2 K
c = 0.4 k J/kg K
p = 8000 kg/m3

A centrifugal pump which circulates a hot liquid metal at 500 degree Celsius is driven by a 3600 rpm electric motor. The motor is coupled to the pump impeller by a horizontal steel shaft of dia 25 mm. Let us assume the motor temperature as 60 degree Celsius with the ambient air at 25 degree Celsius

what length of shaft should be specified between the motor and the pump? It may be presumed that the thermal conductivity of the shaft material is 35W/m K and that the convective film coefficient between the steel shaft and the ambient air is 15.7W/square m K

Heat Transfer from Extended Surfaces

Heat-Transfer