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首页> 外文期刊>International Journal of Heat and Mass Transfer >Influence of wet-particle deposition on air-side heat transfer and pressure drop of fin-and-tube heat exchangers
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Influence of wet-particle deposition on air-side heat transfer and pressure drop of fin-and-tube heat exchangers

机译：湿颗粒沉积对翅片管热交换器空气侧传热和压降的影响

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摘要

Wet particles have higher propensity to deposit on fin surfaces than dry particles, and may cause a more serious deterioration of the air-side performance of fin-and-tube heat exchanger. The purpose of this paper is to experimentally investigate the influence of deposited wet particles on the air-side heat transfer and pressure drop of heat exchangers. Test samples cover three types of fins, i.e., plate fin, wavy fin and louver fin. Experimental conditions cover the inlet air relative humidity of 50-90%, the inlet air velocity of 1.0-3.0 m s(-1), and the particle concentration of 2.1-10.8 g m(-3). The results show that wet particles mostly deposit on the leading edge of fins as well as the front part of tubes, and the louver fin is almost completely blocked by the wet particulate fouling. Moreover, the increase of inlet air relative humidity, particle concentration and the decrease of fin pitch reduce the air-side heat transfer and increase the air side pressure drop after wet particle deposition; the increase of inlet air velocity firstly deteriorates and then enhances the air-side performance; and louver fin is the most conducive to the deterioration of air side performance. (C) 2018 Elsevier Ltd. All rights reserved.
机译：湿颗粒比干颗粒具有更高的沉积在翅片表面的倾向，并且可能导致翅片管式热交换器的空气侧性能更加严重的下降。本文的目的是通过实验研究沉积的湿颗粒对热交换器空气侧传热和压降的影响。测试样品覆盖三种类型的鳍片，即板状鳍片，波浪形鳍片和百叶窗鳍片。实验条件包括进气相对湿度为50-90％，进气速度为1.0-3.0 m s（-1）和颗粒浓度为2.1-10.8 g m（-3）。结果表明，湿颗粒主要沉积在散热片的前缘以及管子的前部，而百叶窗散热片几乎被湿颗粒污垢完全堵塞。此外，进气相对湿度的增加，颗粒浓度的减小和翅片节距的减小会减少空气侧的传热，并增加湿颗粒沉积后空气侧的压降；进气速度的增加首先恶化，然后增强了空气侧的性能。百叶窗散热片最有利于降低空气侧性能。 （C）2018 Elsevier Ltd.保留所有权利。

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