Heat transfer and friction factor correlations development for solar air heater duct artificially roughened with ‘S’ shape ribs

Kumar, K. Ravi; Prajapati, D.R.; Samir, Sushant

doi:10.1016/j.expthermflusci.2016.11.012

Cited by 117 publications

(20 citation statements)

References 20 publications

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“…Experimental research was conducted by Khushmeet Kumar, et al [7] with circular wire arc shape ribs, which were placed in an 'S' shape formation in the duct within an arc angle varying from (α) of 30 • to 75 • with a relative roughness pitch (P/e) 4 to 16mm and relative roughness width (W/w) of 1 to 4mm in the range of Re no 2400 to 20,000. Implementing this "S"-shaped rib results in a higher augmentation in the friction factor (f) and better Nusselt number (Nu), and it was found that the best thermal enhancement was achieved at an arc angle (α) of 60 • .…”

Section: Arc Shape Ribs Set In 'S' Shape (Sr)mentioning

confidence: 99%

“…Implementing passive techniques in an absorber plate by using irregular forms like ribs, grooves, baffles, winglets, and twisted tapes, increases the heat transfer enhancement in solar duct [1][2][3]. Numerous authors [4][5][6][7] have conducted analytical and experimental investigations implementing passive techniques in absorber plates that resulted in heat transfer enhancement. The main goal of this review paper is to provide information about the importance of a rib molded on: (a) Different shaped 3…”

Section: Introductionmentioning

confidence: 99%

“…Arc shape wire ribs arranged in 'S' shape adapted from [7] Heat transfer augmentation and friction factor relative to arc shape significance 0.6667.…”

mentioning

confidence: 99%

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A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

et al. 2018

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In this paper, the effect of various shapes of ribs used in Solar Air Heaters (SAHs) was discussed. The review is concentrated on the geometry of the rib and its location on the SAH panel. Both numerical and experimental works were considered for discussion with dry air and Nano fluids as a working fluid. The influence of various shapes, such as an L shape, W shape, V shape, Multiple V shape, V shape with a gap, detachable & attachable ribs etc., was analyzed. The common fact observed from this analysis is that the implementation of artificial roughness in the absorber plate results in a considerable increase in the rate of heat transfer. Further, it is observed that ‘Multiple V-shaped with open between the ribs’ results in the maximum thermal enhancement when compared to the other shapes.

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Section: Arc Shape Ribs Set In 'S' Shape (Sr)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

et al. 2018

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“…Kumar et al [45] have been examined the consequence of S shape ribs on heat transfer and friction factor. The various variables taken into consideration were Re from 2400 to 20000, p/e from 4 to 16, e/D h from 0.022 to 0.054, from 30° to 75°, W/w from 1 to 4.…”

Section: S Shaped Ribsmentioning

confidence: 99%

Factors influencing the performance of solar air heater (SAH) having artificial coarseness: a review

Bharadwaj

Sharma

Mausam

2021

Journal of Thermal Engineering

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A review of studies focused on promoting the rate of heat transfer with the help of an optimum rise in friction factor, by offering a simulated irregularity to the interior surface of the absorber plate of SAH, is expressed. In this article an effort has been made to explore different coarseness configurations as used by number of researchers to boost the SAH heat transfer rate. Furthermore, different correlations developed by researchers for Nusselt number and friction factor are also presented. On the basis of these correlations, thermohydraulic performance variable was calculated and attributed for various coarseness configurations. Friction factor and Colburn factor of various coarseness configurations have also been com-pared and presented. This review focused on use of different coarseness configurations with different coarseness parameter and flow parameter is deeply discussed from which future researchers can easily identify that which coarseness is to be used for designing SAH duct for the better augmentation of heat transfer and friction factor. It also helps the researchers to determine the optimum value of coarseness parameter so that the SAH works efficiently and effectively.

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“…The adoption of the rectangular ribs which were inclined with 60 over the absorber of SAH tended to enhance heat transfer rate more than the usage of the smooth absorber [5]. The utilization of the wired ribs over the absorber with S shape arrangement was conducted an increase in the Nu under relative roughness pitch of 0.043 [6]. By adding to the previous it was found that the usage of the broken arc ribs over the absorber was led to increase in Nu by 13.8% [7].…”

Section: Introductionmentioning

confidence: 99%

The Improvement of The Solar Air Heater Duct by Wired Ribs Utilization

Al-khafaji¹

2019

Karbala International Journal of Modern Science

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Heat transfer coefficient of the solar air heater duct (SAH) is low due increasing the thermal performance of its absorber. The present study tends to enhance the thermal characteristics of the SAH by adopting the wired ribs on the absorber under different ribs dimensions and arrangements. A rectangular duct is used to form the SAH with length L=1500mm, width w=100mm and height H=30mm. The used heat fluxes over the absorber are 1000W/m2 and 500W/m2 while the operated Reynolds number range is 708 ~ 6375. The utilized wired ribs are arranged over the absorber so as to develop a relative roughness height value (e/D = 0.043) in which generates a relative roughness pitch values of (P/e = 5, 10, 15). Moreover, another arrangement for the wired ribs develops a relative roughness height value (e/D = 0.086) that correspond the relative roughness pitch values of (P/e = 10, 20, 30). The results show an improvement in the average values of the Nusselt number with 9.34 % when e/D = 0.043 and heat flux of 500W/m 2 against the smooth absorber. It is also found that the average values of Nusselt number is improved with 5.31% when e/D=0.043 and heat flux = 1000W/m2.

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Heat transfer and friction factor correlations development for solar air heater duct artificially roughened with ‘S’ shape ribs

Cited by 117 publications

References 20 publications

A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

Factors influencing the performance of solar air heater (SAH) having artificial coarseness: a review

The Improvement of The Solar Air Heater Duct by Wired Ribs Utilization

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