Water flows at the rate of 0.5 kg/s in a 2.5-cm-diameter tube having a length of 3 m. A constant heat flux is imposed at the tube wall so that the tube wall temperature is 40◦C higher than the water temperature. Calculate the heat transfer and estimate the temperature rise in the water. The water is pressurized so that boiling cannot occur.
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Explanation:
Step 1 of 3
To determine the heat transfer and temperature rise in the water, proceed as follows;
Calculate heat transfer rate due to convection using the formula given below,
…… (1)
Here, h is the heat transfer coefficient, A is the surface area, is the surface temperature and is the fluid temperature.
Value of heat transfer coefficient at water flowing speed of in 2.5 cm diameter pipe from Table 1-3 (approximate values of heat transfer coefficient) comes out is, .
It is given that the temperature of wall is higher than water temperature and assume that the temperature of fluid is .
Temperature of tube wall comes out is,
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