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Heat Transfer
Heat Exchangers
GATE 2012
Hard

In a 1-1 pass floating head type shell and tube heat exchanger, the tubes (od=25mm; id=21mm) are arranged in a square pitch. The tube pitch is 32mm. The thermal conductivity of the shell side fluid is 0.19 W/m.K, and the Nusselt number is 200. The shell-side heat transfer coefficient (in W/m².K), rounded off to the nearest integer, is

  • A1100
  • 1400
  • C1800
  • D2100

Explanation

For square pitch, equivalent diameter de=4(pt²−πdo²/4)/(πdo)=4(32²−π×25²/4)/(π×25)=4(1024−490.9)/78.54=2132.5/78.54≈27.15mm=0.02715m. h=Nu·k/de=200×0.19/0.02715≈1400 W/m².K.

Source: GATE CH 2012 (2012)

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