期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 54, 期 7-8, 页码 1598-1607出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2010.11.026
关键词
Hear transfer; Diabatic; Friction factor; Pressure drop; Enhanced tubes; Transition; Fully developed flow; Developing flow; Single-phase; Inlet; Disturbance
资金
- American Society of Heating. Refrigerating and Air-Conditioning Engineers (ASHRAE) [RP-1280]
- University of Pretoria
- Technology and Human Resources for Industry Programme (THRIP) [AL631]
- National Research Foundation
- SANERI/University of Stellenbosch Solar Hub
Due to efficiency demands, augmented tubes are often used in heat exchangers with the result that many heat exchangers operate in the transitional region of flow. Due to the paucity of data, however, no data exists for enhanced tubes in this region. This article, being the second of a two-part paper (Part I investigating adiabatic flow), presents experimental heat transfer and diabatic friction factor data for four horizontal enhanced tubes for fully developed and developing flow in the transition region with four different types of inlet geometries. Smooth tube data was used for comparison. It was found that, unlike results obtained for adiabatic flow in Part I, inlet disturbances had no effect on the critical Reynolds numbers, with transition occurring at a Reynolds number of approximately 2000 and ending at 3000. Correlations were developed to predict the heat transfer and friction factors for a wide range of flow regimes, from laminar to turbulent flow. The correlations predicted the heat transfer data on average with a mean absolute error of 9.5%. predicting 85% of the data to within 15%. The friction factor correlations predicted the data with a mean absolute error of 5.5%. predicting 96% of the data to within 20%. (C) 2010 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据