Impact of artificial roughness variation on heat transfer and friction characteristics of solar air heating system

Kumar, Raj; Kumar, Rakesh; Kumar, Sushil; Thapa, Sashank; Sethi, Muneesh; Fekete, Gusztáv; Singh, Tej

doi:10.1016/j.aej.2021.06.031

Cited by 46 publications

(6 citation statements)

References 41 publications

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“…Among the passive technologies, artificial roughness is the current choice of researchers. Many researchers 16–41,43–45,47–62 have worked on it and suggested that artificial roughness inside the receiver surface effectively enhances the thermal characteristics of a receiver as compared to a smooth surface.…”

Section: Discussionmentioning

confidence: 99%

“…Many researchers 14,15 have done research on solar thermal applications by using nanofluid and found that heat transfer rate is improved, and the efficiency of the receiver is increased by 7–15% as compared to basic fluid. Geometrical Modification (Artificial roughness): Artificial roughness is the most attractive approach because it can improve heat transfer coefficients while reducing frictional losses. 16,17 Previous studies revealed that heat transmission from fluid to a solid surface is increased by extending the contact area (i.e. extended surface) and introducing turbulence, which encourages mixing between the various fluid layers.…”

Section: Introductionmentioning

confidence: 99%

“…Geometrical Modification (Artificial roughness): Artificial roughness is the most attractive approach because it can improve heat transfer coefficients while reducing frictional losses. 16,17 Previous studies revealed that heat transmission from fluid to a solid surface is increased by extending the contact area (i.e. extended surface) and introducing turbulence, which encourages mixing between the various fluid layers.…”

Section: Introductionmentioning

confidence: 99%

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A review study on the performance enhancement of solar parabolic trough receiver by various passive techniques

Singh

Samir²,

Kumar

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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This is a new era where the world’s energy consumption is so high and is likely to increase over 60% of current consumption by the year 2030. Therefore, renewable energy should be used most frequently. The most preferred alternative to fossil fuels is solar energy but converting solar energy into usable form is the most challenging part. The conversion to thermal energy is the one option. In the area of solar thermal power generation, a solar parabolic trough (SPT) collector is an effective method. Also, the use of passive methods to enhance the thermal performance of these parabolic trough receivers is currently the researcher’s interest This review study is focused on different types of geometrical modification (Artificial roughness) used to enhance the thermal performance of SPT receivers. Based on the extensive study it has been found that conical strip insert is a very broad field for research as it can enhance the thermal performance up to 5–10 times. Also there are parameters associated with the conical strips like shape, pitch, angle of twist, slant angle, geometry angle, etc. which can contribute to better performance when used in SPT receiver.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A review study on the performance enhancement of solar parabolic trough receiver by various passive techniques

Singh

Samir²,

Kumar

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…The utilization of w-type roughened SAH developed [ 40 , 41 ] accompanied by similar distance on the channels for improvement of Nu number with an additional effect of booster mirrors. Similarly, a number of works have been reported in the most recent years to show the extensive improvements in exergy, CFD, and THP of solar air collectors by using different methodologies [ 42 , 43 , 44 , 45 , 46 , 47 , 48 ].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Three Side Roughened Solar Air Heater: A Preliminary Investigation

Behura

Mohanty

Singh³

et al. 2022

Materials

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In recent years, sunlight has been used in several fields such as photovoltaic cells, flat plate collectors, solar cookers, green buildings, and agricultural applications. Improved thermal performance has been seen which comes of three sides absorber plate with glass cover compared to the traditional one. This paper presents the Nusselt (Nu) number, collector efficiency factor (CEF), and collector heat removal factor (CHRF) for the optimal solution of three sides artificially roughened solar air heater. Five input variables such as Reynolds (Re) number, relative roughness pitch, relative roughness height, mass flow rate, and air temperature of the duct are taken into account for improved efficiency optimization of collector, collector heat removal factor, and Nu number. Technique for order of preference by similarity to ideal solution (TOPSIS) technique is used to identify the best alternative amongst a number of performance measures by converting them into an equivalent single variable. Moreover, the results revealed the high accuracy of the CEF, CHRF, and Nu number of 75–80%, 74–78%, and 63–71%, respectively. Meanwhile, it has been also observed that roughness Re number varies between 12,500 and 13,500, and height of relative roughness is 0.0245, including pitch of relative roughness 10 along with the rate of mass flow is 0.041 kg/s.

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“…Utilization of nanofluids (NFs) is one of the approaches to enhance heat transfer (HT), as traditional fluids, like, engine oil, ethylene glycol, and water have moderately low heat transfer rate (HTR) [2,3]. Turbulence promoters and numerous geometrical shapes of the rib-groove duct are commonly used, since they cause stream division and reattachment, thus breaking the laminar viscous layer and causing enhanced heat transfer [4,5].…”

Section: Introductionmentioning

confidence: 99%

Development of New Correlations and Parametric Optimization in Nanofluid Flow through Protruded Roughened Square Channel

Kumar

Gupta

Tchier

et al. 2022

Mathematical Problems in Engineering

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This study discusses the optimization of heat-transfer parameters in nanofluid flow through a rough square surface channel including a protruded rib compound transverse pattern using response surface methodology (RSM). Flow and geometrical characteristics are optimized, resulting in optimal flow friction and heat transfer performances. The comparison of RSM’s estimated values to experimentally observed values was abandoned. The results demonstrate that the RSM-calculated values agree with the observed values and are within the 5.5 percent uncertainty limitations. Statistical correlations for Nusselt number and friction factor have been developed as functions of protrusion transverse rib height, protrusion transverse rib diameter, X-axis pitch, Y-axis pitch, and Reynolds number. These correlations have been found to predict the values within the error limits of ±8.9% and ±8.7%, respectively. On the basis of correlations developed for Nusselt number and friction factor, an attempt has been made to compare the thermohydraulic performance of protruded roughened square channel.

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Impact of artificial roughness variation on heat transfer and friction characteristics of solar air heating system

Cited by 46 publications

References 41 publications

A review study on the performance enhancement of solar parabolic trough receiver by various passive techniques

A review study on the performance enhancement of solar parabolic trough receiver by various passive techniques

Performance Analysis of Three Side Roughened Solar Air Heater: A Preliminary Investigation

Development of New Correlations and Parametric Optimization in Nanofluid Flow through Protruded Roughened Square Channel

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