VI Semester Thermal Engineering Lab – II (Manual Cum Observation)
HEAT TRANSFER IN FORCED CONVECTION
To determine the heat transfer co-efficient by using forced convection Apparatus.
(iii) U – tube manometer
Apparatus consist of blower unit fitted with the test pipe. The test section is surrounded by
Nichrome band heater. Four thermocouples are embedded on the test section and two
thermocouples are placed in the air stream at the entrance and exit of the test section to
measure the air temperature. Test pipe is connected to the delivery side of the blower along
with the orifice to measure flow of air through the pipe. Input to the heater is given through a
dimmerstat and measured by meters. It is to be noted that only a part of the total heat
supplied is utilized in heating the air. A temperature indicator with cold junction
compensation is provided to measure temperatures of pipe wall at various points in the test
section. Air flow is measured with the help of orifice meter and the water manometer fitted
on the board.