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Session 2526

Experimental Comparison Between Heat Transfer Enhancement Methods in Heat Exchangers

Hosni I. Abu-Mulaweh Department of Engineering Indiana University-Purdue University at Fort Wayne Fort Wayne, IN 46805, USA

Abstract

This paper presents an experimental comparison between four different types of heat transfer enhancement techniques or methods in heat exchangers: Two insert devices (displacement device and swirl flow device), extended surfaces, and obstruction devices. The objective of these experiments is to assist the undergraduate mechanical engineering students in the understanding of the basic heat transfer processes and the methods and devices that can be implemented to enhance the heat transfer.

The experimental setup and apparatus required to carry out these experiments is relatively simple. It includes five tube-within-a-tube heat exchangers that are instrumented with three thermocouples at each end, two rotameters, heating element, water pump, and Data Acquisition. Four of the five heat exchangers are modified by one type of the above-mentioned heat transfer enhancement techniques. These equipments are relatively inexpensive and available in almost all undergraduate heat transfer laboratories.

I. Introduction

Heat transfer enhancement in heat exchangers is gaining industrial importance because it gives one the opportunity to reduce the heat transfer surface area required for a given application and thus reduce the heat exchanger size and cost, increase the heat duty of the exchanger for fixed surface area, reduce logarithmic mean temperature difference (LMTD) for fixed heat duty and surface area, and reduce pumping power for fixed heat duty and surface area. The automotive and refrigeration industries routinely use enhanced surfaces in their heat exchangers. Also, the process industry is aggressively working to incorporate enhanced heat transfer surfaces in their heat exchangers.

Bergles et al. [1] has identified thirteen enhancement techniques. These techniques can be

Proceedings of the 2001 American Society for Engineering Education Annual Conference & Exposition Copyright © 2001, American Society for Engineering Education

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Abu-Mulaweh, H. (2001, June), Experimental Comparison Between Heat Transfer Enhancement Methods In Heat Exchangers Paper presented at 2001 Annual Conference, Albuquerque, New Mexico. 10.18260/1-2--9259