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首页> 外文期刊>Renewable energy >Development of correlations for Nusselt number and friction factor for solar air heater with roughened duct having multi v-shaped with gap rib as artificial roughness
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Development of correlations for Nusselt number and friction factor for solar air heater with roughened duct having multi v-shaped with gap rib as artificial roughness

机译：带有多V形且带有间隙肋作为人工粗糙度的粗糙风管的太阳能空气加热器的努塞尔数和摩擦系数的相关性开发

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摘要

This paper presents the results of an experimental investigation of heat transfer and friction in the flow of air in rectangular ducts having multi v-shaped rib with gap roughness on one broad wall. The investigation encompassed Reynolds number (Re) from 2000 to 20,000, relative gap distance (G_d/L_v) values of 0.24—0.80, relative gap width (g/e) values of 0.5-1.5, relative roughness height (e/D) values of 0.022—0.043, relative roughness pitch (P/e) values of 6-12, relative roughness width ratio (W/w) values of 1-10, angle of attack (α) range of 30°—75°. The optimum values of geometrical parameters of roughness have been obtained and discussed. For Nusselt number (Nu), the maximum enhancement of the order of 6.74 times of the corresponding value of the smooth duct has been obtained, however the friction factor (f) has also been seen to increase by 6.37 times of that of the smooth duct. The rib parameters corresponding to maximum increase in Nu and / were G_d/L_v = 0.69, g/e = 1.0, e/D = 0.043, P/e = 8, W/w = 6 and α = 60°. Based on the experimental data, correlations for Nu and / have been developed as function of roughness parameters of multi v-shaped with gap rib and flow Reynolds number.
机译：本文介绍了一个实验研究的结果，该研究是在具有多个v形肋且在一个宽壁上具有间隙粗糙度的矩形管道中的空气流动中的传热和摩擦研究。研究包括2000到20,000的雷诺数（Re），相对间隙距离（G_d / L_v）值为0.24-0.80，相对间隙宽度（g / e）值为0.5-1.5，相对粗糙度高度（e / D）值0.022-0.043的相对值，相对粗糙度间距（P / e）值为6-12，相对粗糙度宽度比（W / w）值为1-10，迎角（α）范围为30°-75°。已经获得并讨论了粗糙度几何参数的最佳值。对于Nusselt数（Nu），已获得最大平滑管道对应值的6.74倍量级的增强，但是摩擦系数（f）也增加了平滑管道对应值的6.37倍。对应于Nu和/的最大增加的肋骨参数为G_d / L_v = 0.69，g / e = 1.0，e / D = 0.043，P / e = 8，W / w = 6和α= 60°。基于实验数据，已开发了Nu和/的相关性，该函数是具有间隙肋和流动雷诺数的多v形粗糙度参数的函数。

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  • 来源
    《Renewable energy》 |2013年第10期|151-163|共13页
  • 作者

    Anil Kumar; R.P. Saini; J.S. Saini;

  • 作者单位

    Mechanical Engineering Department, Shoolini University, Solan 173229, Himachal Pradesh, India;

    Alternate Hydro Energy Centre, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India;

    Mechanical & Industrial Engineering Department, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    solar air heater; nusselt number; friction factor; cap distance; cap width;

    机译：太阳能空气加热器努塞尔数摩擦系数帽距帽宽;

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