Heat transfer coefficient and friction factor correlations for rectangular solar air heater duct having transverse wedge shaped rib roughness on the absorber plate

Bhagoria, J.L.; Saini, J.S.; Solanki, S.C.

doi:10.1016/s0960-1481(01)00057-x

Cited by 305 publications

(82 citation statements)

References 10 publications

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“…The nonselective absorber surface exhibited more thermal radiation emission than convective loss, thus making the radiative loss component dominant (Mintsa Do Ango et al [31] and Gao et al [15] ). Bhagoria et al [32] and Gao et al [15] propose the use of rough surfaces to improve the convective heat transfer coefficient. In the natural convection and analytical approach of Gao et al [15] in which a flat absorbing and flat bottom plates were used as the air flow channels, constant values of h rgs , h rpg , and h cpf reported were, respectively, 12.4, 5.9, and 8.8 W m…”

Section: Effect Of Design Decisionsmentioning

confidence: 99%

Distributed mathematical model supporting design and construction of solar collectors for drying

et al. 2017

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Coupled partial differential equations were developed to investigate which collector lengths are appropriate for drying and adsorbent regeneration under prevailing Ghanaian weather. Unlike approaches based on empirical data, the numerical model is more flexible. Effects of operational and design variables on outlet temperature and performance were systematically studied. Collector length and air speed affect performance indicators. Operational overall heat loss coefficient, an important characteristic of the collector, is not constant but varies during the day. With plausible physical parameters, the model describes the experimental data well. Collector lengths of 1.5 and 4.5 m suited drying and regeneration, respectively.

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Section: Effect Of Design Decisionsmentioning

confidence: 99%

Distributed mathematical model supporting design and construction of solar collectors for drying

et al. 2017

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“…Bhagoria,Saini,Solanki [3] performed this experiment to collect heat transfer and friction data for forced convection flow of air in solar air heater rectangular duct with one broad wall roughened by wedge shaped transverse integral ribs. The experiment encompassed the Reynolds number range from 3000 to 18000; relative roughness height 0.015 to 0.033; the relative roughness pitch 60.17Ф-1.0264<p/e<12.12; and rib wedge angle (f) of 8, 10, 12 and 15°.…”

Section: Wedge Shaped Ribsmentioning

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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“…A lot of research has been made in this particular field and many designs have been tested both experimentally and computationally. Bhagoria and Saini [1] conducted experiments on rectangular duct solar air heaters where they added roughness through wedge shaped turbulators having fixed values of relative roughness height and wedge angle. They found that varying the pitch of the roughness affected the heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Augmentation of Effective Thermal Gain of Solar Air Heater using a Novel Turbulator Design- A CFD Study

Dhagat

Manjunath

2018

MATEC Web Conf.

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Abstract. Augmentation of thermal performance of solar air heater has been the focus of many researchers over the last decades and the use of turbulator or artificial roughness to provide increased fluid mixing in order to achieve augmented heat transfer has been a widely accepted technique. This work aims to evaluate the effect of a novel turbulator design on the effective thermal performance of solar air heater using the methodology of computational fluid dynamics (CFD). A two dimensional CFD analysis is carried out to evaluate the thermal characteristics of solar air heater at various flow Reynolds number conditions for different geometric parameters of the proposed turbulator design. The pitch of the turbulator is varied as 10mm, 20mm, 30mm, 40mm and 50mm for a fixed turbulator height of 2 mm. The Reynolds number is varied from 6,000 to 27,000. The analysis shows that the lower values of pitch produces higher improvement in heat transfer. The maximum increase in Nusselt number is found to be about 2.98 times as compared to the base model for the flow Reynolds number of about 6000. The highest increase in the friction factor is found to be about 3.05 times relative to the base model. The maximum thermal enhancement factor is found to be about 1.99 for the pitch value of 10 mm at a flow Reynolds number of about 6000.

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Heat transfer coefficient and friction factor correlations for rectangular solar air heater duct having transverse wedge shaped rib roughness on the absorber plate

Cited by 305 publications

References 10 publications

Distributed mathematical model supporting design and construction of solar collectors for drying

Distributed mathematical model supporting design and construction of solar collectors for drying

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

Augmentation of Effective Thermal Gain of Solar Air Heater using a Novel Turbulator Design- A CFD Study

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