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Type: Thesis
Title: Flow through a model fin and tube heat exchanger and its influence on mass and heat transfer
Author: Gilbert, Gregory Phillip
Issue Date: 1987
School/Discipline: Dept. of Mechanical Engineering
Abstract: 1.1 The aim of this project was to increase the understanding of flow patterns within a fin and tube heat exchanger and to evaluate the flow characteristics in terms of current coil selection methods within the air conditioning industry. 1.2 A four times scale model of a plate fin and tube heat exchanger was placed within a windtunnel under dynamically similar flow conditions to those of an actual heat exchanger. The conditions simulated were; a. one tube row, two tube rows - inline and staggered, b. fin spacings of 4, 6 and 8 fins/inch, and c. face velocities 1.0 m/s, 2.0 m/s, 3.0 m/s and 4.0 m/s. Flow visualization techniques, including smoke wires and china clay were used to obtain qualitative results, while local heat transfer surface gauges were used to obtain approximate values of local heat transfer coefficients at numerous fin positions. The visualization and gauge results dramatically illustrate the major flow patterns on the airside of a plate fin and tube heat exchanger. The following characterisitic zones were observed; a. laminar inlet and channel flow regions, b. a low heat transfer zone behind the tubes, and c. a U shaped vortex system around the tubes. 1.3 Using these flow pattern results, a mathematical model was developed in an effort to improve coil optimization techniques. The proposed model can be readily incorporated into existing computer simulation programs. 1.4 Throughout this project, special consideration has been given to the low-velocity operation of fin and tube heat exchangers, in an effort to reinforce the work concurrently undertaken in the University of Adelaide 1 s controlled environment windtunnel.
Advisor: Luxton, RE
Dissertation Note: Thesis (M. Eng. Sc.)--University of Adelaide, 1988
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