Repeat Prob. 7108 for staggered arrangement with S L = S T = 6 cm. Data from
Question:
Repeat Prob. 7–108 for staggered arrangement with SL = ST = 6 cm.
Data from problem 108
Combustion air in a manufacturing facility is to be preheated before entering a furnace by hot water at 90°C flowing through the tubes of a tube bank located in a duct. Air enters the duct at 15°C and 1 atm with a mean velocity of 3.8 m/s, and flows over the tubes in normal direction. The outer diameter of the tubes is 2.1 cm, and the tubes are arranged in-line with longitudinal and transverse pitches of SL = ST = 5 cm. There are eight rows in the flow direction with eight tubes in each row. Determine the rate of heat transfer per unit length of the tubes, and the pressure drop across the tube bank. Evaluate the air properties at an assumed mean temperature of 20°C and 1 atm. Is this a good assumption?
Step by Step Answer:
Heat And Mass Transfer Fundamentals And Applications
ISBN: 9780073398181
5th Edition
Authors: Yunus Cengel, Afshin Ghajar