Open Access

ARTICLE

HYDROTHERMAL CHARACTERISTICS OF WATER FLOW INTO A DIMPLED TUBE HEAT EXCHANGER: A PARAMETRIC STUDY

by

Department of Mechanical Engineering, College of Engineering, Mustansiriyah University, Baghdad, Iraq.
* Corresponding author. Email: ehma026@uomustansiriyah.edu

Frontiers in Heat and Mass Transfer 2022, 19, 1-10. https://doi.org/10.5098/hmt.19.39

Abstract

In this study, the hydrothermal water flow characteristics using a dimpled inner tube heat exchanger are investigated experimentally and numerically. A numerical analysis has performed on two types of dimpled tubes (In-lined and staggered distributions) for two distribution angles 60o and 90o , and two dimple diameters(4 mm and 6 mm) with constant pitch ratio (X/d=8). In experimental part, a staggered arrangement dimpled inner tube distribution with angle 60o , dimple diameter of 6 mm and constant pitch ratio (X/d=8)is used as well as plain tube. The results illustrate that the heat transfer as Nusselt number for case of staggered dimpled inner tube improved between 7.55 and 11.2 times than plain tube. The numerical results demonstrate that staggered distribution of dimpled inner tube improve the Nusselt number nearly with 50% bigger than that the in-line distribution dimpled tube. The thermal performance factor (TPF) varied from 1.67 to 5.22 for tubes with in-line arrangement while from 4.91 to 8.633 for dimple tubes with a staggered arrangement.

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Keywords

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