Experimental investigations on heat transfer and frictional characteristics of a turbulator roughened solar air heater duct

Bopche, Santosh B.; Tandale, Madhukar S.

doi:10.1016/j.ijheatmasstransfer.2008.09.039

Cited by 156 publications

(45 citation statements)

References 35 publications

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“…Tall height tabulators, such as baffles, are generally used for increasing heat transfer rates due to the turbulence in the flow field. Typical shapes of baffles are transverse, angled shaped, V-shaped, perforated, and have multiple blockages that can be fitted and bent away from the heated wall to produce turbulence in the flow field that results in an improvement of Nu ave [6][7][8][9][10][11][12]. Furthermore, these baffles are modified to improve the thermo-hydraulic performance.…”

Section: Introductionmentioning

confidence: 99%

“…Sriromreun et al [8] experimentally determined the values of Nu and f for an air passage with a Z-type blockage. Bopche and Tandale [9] reported the turbulent flow in a rectangular passage rough with a U-pattern blockage. Skullong et al [10] carried out an analytical study on the turbulent passage flow and Nu ave and f ave behaviour in a rectangular passage equipped with a blockage and groove blockage.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Hydraulic Performance in a Solar Air Heater Channel with Multi V-Type Perforated Baffles

Kumar

Kim

2016

Energies

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This article presents heat transfer and fluid flow characteristics in a solar air heater (SAH) channel with multi V-type perforated baffles. The flow passage has an aspect ratio of 10. The relative baffle height, relative pitch, relative baffle hole position, flow attack angle, and baffle open area ratio are 0.6, 8.0, 0.42, 60˝, and 12%, respectively. The Reynolds numbers considered in the study was in the range of 3000-10,000. The re-normalization group (RNG) k-ε turbulence model has been used for numerical analysis, and the optimum relative baffle width has been investigated considering relative baffle widths of 1.0-7.0.The numerical results are in good agreement with the experimental data for the range considered in the study. Multi V-type perforated baffles are shown to have better thermal performance as compared to other baffle shapes in a rectangular passage. The overall thermal hydraulic performance shows the maximum value at the relative baffle width of 5.0.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Hydraulic Performance in a Solar Air Heater Channel with Multi V-Type Perforated Baffles

Kumar

Kim

2016

Energies

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“…Bopche and Tandale [7] studied heat transfer coefficient and friction factor by using artificial roughness of inverted U shape on the absorber plate. The part of the duct which was roughened was heated in uniform manner while other three parts were well insulated.The research parameters were as Reynolds number range in between 3800 to 18000; e/Dh = 0.0186 to 0.03986 (Dh = 37.63 mm ande = 0.7 to 1.5 mm) while p/e = 6.67 to 57.14 (p = 10 to40 mm).…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Solar Air Heater Having Multiple Arc With Gap Type Artificial Roughness and Thermal Storage

2017

IJAERD

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“…It shows the best thermal performance at a relative roughness pitch value of 8. Bopche et al [12] conducted experimental investigation to study the heat transfer coefficient and friction factor by using artificial roughness in the form of inverted U-shaped turbulators. The outcome of the experimental work was an enhancement in heat transfer and friction factor of the order 2.82 and 3.72 times, respectively, as compared to smooth duct.…”

Section: Introductionmentioning

confidence: 99%

Experimental and CFD-based thermal performance prediction of solar air heater provided with right-angle triangular rib as artificial roughness

Gawande

Dhoble

Zodpe

et al. 2015

J Braz. Soc. Mech. Sci. Eng.

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An experimental and two-dimensional computational fluid dynamics (CFD) analysis of a solar air heater has been carried out using right-angle triangular ribs as artificial roughness on the absorber plate as a convenient method for enhancement of thermal performance of solar air heater. The relative roughness pitch (P/ e = 7.14-35.71), Reynolds number (Re = 3800-18000), and relative roughness height (e/D = 0.021-0.042) have been selected as design variables for both analysis. ANSYS FLUENT 14.5 with renormalization group k-e turbulence model is selected for the analysis of computational domain of solar air heater during CFD analysis. An enhancement in Nusselt number and friction factor with a decrease in relative roughness pitch (P/e) and increase in relative roughness height are presented and discussed with reference to experimental investigation and CFD analysis. The results of roughened solar air heater duct have been compared with smooth duct under similar flow condition. The optimum value of rib configuration based on constant pumping power requirement has been derived using thermo-hydraulic performance parameter and has been found 2.03 at P/e = 7.14. e/D = 0.042 and at a Reynolds number of 15,000 for the investigated range of parameters.

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Experimental investigations on heat transfer and frictional characteristics of a turbulator roughened solar air heater duct

Cited by 156 publications

References 35 publications

Thermal Hydraulic Performance in a Solar Air Heater Channel with Multi V-Type Perforated Baffles

Thermal Hydraulic Performance in a Solar Air Heater Channel with Multi V-Type Perforated Baffles

Performance Analysis of a Solar Air Heater Having Multiple Arc With Gap Type Artificial Roughness and Thermal Storage

Experimental and CFD-based thermal performance prediction of solar air heater provided with right-angle triangular rib as artificial roughness

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