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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
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Phoniex University
Oct-2001 - Nov-2016
EXAMPLE 7.7
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Pressurized water is often available at elevated temperatures and may be used for space heat- ing or industrial process applications. In such cases it is customary to use a tube bundle in which the water is passed through the tubes, while air is passed in cross flow over the tubes. Consider a staggered arrangement for which the tube outside diameter is 16.4 mm and the
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longitudinal and transverse pitches are SL = 34.3 mm and ST = 31.3 mm. There are seven rows of tubes in the airflow direction and eight tubes per row. Under typical operating condi- tions the cylinder surface temperature is at 70°C, while the air upstream temperature and velocity are 15°C and 6 m/s, respectively. Determine the air-side convection coefficient and the rate of heat transfer for the tube bundle. What is the air-side pressure drop?
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Q86
7.1Â Â Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate with velocity of 1 m/s: atmospheric air, water, engine oil, and mercury.
(a)Â Â Â For each fluid, determine the velocity and thermal boundary layer thicknesses at a distance of 40 mm from the leading edge.
For each of the prescribed fluids and on the same coordinates, plot the boundary layer thicknesses  as
a function of distance from the leading edge to a plate length of 40 mm.
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