Heat transfer and friction characteristics of solar air heater ducts having integral inclined discrete ribs on absorber plate

Aharwal, K. R.; Gandhi, Bhupendra K.; Saini, J.S.

doi:10.1016/j.ijheatmasstransfer.2009.05.032

Cited by 156 publications

(42 citation statements)

References 14 publications

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“…Taslim et al (1996) observed that, heat transfer from the heated surfaces roughened with V-down ribs is low near the trailing ends, due to heating up of the air as it moves along the ribs from leading to trailing ends. Aharwal et al (2009) (2011) also concluded that introduction of a gap near the trailing end of the inclined and Vshaped ribs respectively, enhances the rate of heat transfer from the absorber plate of a solar air heater. As shown in the figure, fixing of a small staggered rib piece in front of each gap at a distance of 2/3 rd of the pitch, further improves the rate of heat transfer.…”

Section: Flow Patterns In Duct Roughened On One Broad Sidementioning

confidence: 99%

“…transverse ribs (Gupta et al (1993)), inclined ribs (Gupta et al (1997)), V-shaped ribs (Momin et al (2002)), staggered discrete V-shaped ribs (Mulluwork (2000)), V-up and V-down discrete ribs (Karwa (2003)), inclined rib with gap (Aharwal et al (2009)), V-rib with gap (Singh et al (2011)) and multi V-rib with gaps (Anil et al (2013)) resulted in enhancement of the performance of solar air heaters. Patil et al (2012) experimented with a variation of the V-rib with one gap geometry by fixing a staggered rib piece in front of each gap and reported improvement in heat transfer and thermohydraulic performance.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Alterations in V-down Rib on the Performance of an Artificially Roughened Solar Air Heater Duct

Deo¹,

Chander

Saini³

2016

AJHMT

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The present study is focused on the selection of a rib roughness geometry having best thermohydraulic performance among various alternatives of the V-down type configuration. The continuous V-down (type I) rib roughness pattern along with its four alternatives viz. V-down rib with two gaps (type II), V-down rib with two gaps combined with staggered ribs (type III), V-down rib with four gaps (type IV) and V-down rib with four gaps combined with staggered ribs (type V) were evaluated by calculating the Nusselt number, friction factor and thermohydraulic performance parameter values. All roughness patterns were applied on one broad wall of a high aspect ratio (12:1) solar air heater duct and data was collected by varying Reynolds number from 4000 to 12000 (5 levels) during the testing of each absorber plate. Present study used fixed values of pitch-to-rib height (P/e) ratio of 12, rib height-to-hydraulic diameter (e/D h ) ratio of 0.044, angle of attack (α) of 60°, staggered rib length to height ratio (w/e) of 4.5 and relative staggered rib pitch (p/P) of 0.65. Results revealed that, thermohydraulic performance of type II, III and V were superior as compared to the type I by 8.2-13.8%, 13.7-20.4% and 34.6-54.5% respectively, whereas the thermohydraulic performance of type IV was inferior to the type I by 1.5-14.9% for the range of Reynolds numbers evaluated.

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Section: Flow Patterns In Duct Roughened On One Broad Sidementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Alterations in V-down Rib on the Performance of an Artificially Roughened Solar Air Heater Duct

Deo¹,

Chander

Saini³

2016

AJHMT

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“…Aharwal,Saini,Gandhi [7] done this experiment to to present the experimental investigation of heat transfer and friction factor characteristics of a rectangular duct roughened with repeated square cross-section split-rib with a gap, on one broad wall arranged at an inclination with respect to the flow direction. The duct has a width to height ratio (W/H) of 5.84, relative roughness pitch (P/e) of 10, relative roughness height (e/Dh) of 0.0377, and angle of attack (α) of 60˚.…”

Section: Gap In Inclined Continuous Ribmentioning

confidence: 99%

Heat Transfer and Thermal Efficiency of Solar Air Heater Having Artificial Roughness: A Review

Saurav¹

2013

IJRSE

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Abstract-Artificial roughness applied on the absorber plate is the most efficient method to improve thermal performance of solar air heaters .Experimental investigations appropriate to distinct roughness geometries shows that the enhancement in heat transfer is accompanied by considerable rise in pumping power. In view of the fact, a designer needs to carefully examine shape and orientation of roughness elements in order to choose the best fit roughness geometry for intended application. In this paper some distinguished roughness geometry has been compared on the basis of heat transfer enhancement and thermo hydraulic performance. The objective of this paper is to review various studies, in which different artificial roughness elements are used to enhance the heat transfer rate with little penalty of friction. Correlations developed by various researchers with the help of experimental results for heat transfer and friction factor for solar air heater ducts by taking different roughened surfaces geometries are given in tabular form. These correlations are used to predict the thermo hydraulic performance of solar air heaters having roughened ducts.

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“…To reduce frictional losses investigator, introduce gaps with in the roughness geometries; viz. inclined rib with gap [(i.e., [11]) V-rib with gap [(i.e., [12]) and multi V-rib with gap [(i.e., [13]) With the help of gap added advantage of secondary flow through the gaps while moving along inclined ribs and through gaps fluid accelerated which erupting the growth of boundary layer and on the other hand friction factor encountered less then continuous ribs. Other than inclined and transverse ribs roughness arc shape roughness are also investigated to enhance the heat transfer and efficiency of solar air heater.…”

Section: Introductionmentioning

confidence: 99%

Exergetic Performance Evaluation and Comparative Study of A Roughened Solar Air Heater using MATLAB

Kumar¹,

Bisht²

2017

IJERT

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Heat transfer and friction characteristics of solar air heater ducts having integral inclined discrete ribs on absorber plate

Cited by 156 publications

References 14 publications

Effect of Alterations in V-down Rib on the Performance of an Artificially Roughened Solar Air Heater Duct

Effect of Alterations in V-down Rib on the Performance of an Artificially Roughened Solar Air Heater Duct

Heat Transfer and Thermal Efficiency of Solar Air Heater Having Artificial Roughness: A Review

Exergetic Performance Evaluation and Comparative Study of A Roughened Solar Air Heater using MATLAB

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