Investigation of Inclined Turbulators for Heat Transfer Enhancement in a Solar Air Heater

Bhattacharyya, Suvanjan; Chattopadhyay, Himadri; Guin, Anindya; Benim, Ali Cemal

doi:10.1080/01457632.2018.1474593

Cited by 53 publications

(18 citation statements)

References 33 publications

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“…Based on the Nusselt numbers, it is evident that the channel with twisted geometry have higher convective heat transfer (HT) compared that of the plain channel [1]. Interruption of the fluid flow (starting from the inlet of the experimental rig) owing to the occurrence of the twist leads to secondary flows and enhances fluid mixing [37]. It is also clear from Figure 4 that the Nusselt numbers are higher for small pitch ratio (S = p/d).…”

Section: Modellingmentioning

confidence: 97%

Heat transfer and flow field in a circular twisted channel

et al. 2018

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In the present paper, along with experimental study, computational fluid dynamics analysis is performed, using the transition SST model which can predict the change of flow regime from laminar through transition to turbulent. The differential governing equations are discretized by the finite volume method. The investigations are conducted for Reynolds numbers ranging from 100 to 50,000 covering laminar, transitional and turbulent regimes, and for three length and three pitch ratios. The predictions are observed to show a good agreement with the measurements and published correlations of other authors. The analysis indicates that the large length ratio and small pitch ratio yields a higher heat transfer rate with relatively low performance penalty. The transition from laminar to turbulent regime is observed between Reynolds numbers of 2,500 to 3,500 for all cases. For almost all investigated cases the performance factors are greater than unity.

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Section: Modellingmentioning

confidence: 97%

Heat transfer and flow field in a circular twisted channel

et al. 2018

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“…To evaluate the effect of heat transfer enhancement under given pumping power, the thermohydraulic performance factor, η, [35][36][37] is used, where the subscript 0 refers to the smooth tube:…”

Section: Data Reductionmentioning

confidence: 99%

Experimental and numerical analysis of forced convection in a twisted tube

et al. 2019

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Original scientific paper https://doi.org/10.2298/TSCI19S4043BIn the present paper, along with experimental study, CFD analysis of forced convection in a twisted tube is performed, using the transition SST model which can predict the change of flow regime from laminar through transition to turbulent. The differential governing equations are discretized by the finite volume method. The investigations are conducted for Reynolds numbers ranging from 100 to 50000 covering laminar, transitional and turbulent regimes, and for three length and three pitch ratios. The predictions are observed to show a good agreement with the measurements and published correlations of other authors. The analysis indicates that the large length ratio and small pitch ratio yields a higher heat transfer rate with relatively low performance penalty. The transition from laminar to turbulent regime is observed between Reynolds numbers of 2500 to 3500 for all cases. For almost all investigated cases the performance factors are greater than unity.

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“…The fluids at different temperature transfer the energy between them, and hence, the energy exchange takes place. To further increase the heat transfer rate between the fluids, some additional attachment in the form of swirl generators [2][3][4][5][6][7][8][9][10], surface roughness [11][12][13][14][15][16][17] and other modifications [18][19][20][21][22] in the design of the heat exchangers are required. The purpose of using such a modification is to enhance the turbulence in the flow field, which leads to a disturbance in the boundary layer, promotion of secondary flow and better mixing of hot elements with cold field elements [5,[23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Heat and Fluid Flow Analysis and ANN-Based Prediction of A Novel Spring Corrugated Tape

et al. 2021

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A circular tube fitted with novel corrugated spring tape inserts has been investigated. Air was used as the working fluid. A thorough literature review has been done and this geometry has not been studied previously, neither experimentally nor theoretically. A novel experimental investigation of this enhanced geometry can, therefore, be treated as a new substantial contribution in the open literature. Three different spring ratio and depth ratio has been used in this study. Increase in thermal energy transport coefficient is noticed with increase in depth ratio. Corrugated spring tape shows promising results towards heat transfer enhancement. This geometry performs significantly better (60% to 75% increase in heat duty at constant pumping power and 20% to 31% reduction in pumping power at constant heat duty) than simple spring tape. This paper also presented a statistical analysis of the heat transfer and fluid flow by developing an artificial neural network (ANN)-based machine learning (ML) model. The model is evaluated to have an accuracy of 98.00% on unknown test data. These models will help the researchers working in heat transfer enhancement-based experiments to understand and predict the output. As a result, the time and cost of the experiments will reduce. The results of this investigation can be used in designing heat exchangers.

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Investigation of Inclined Turbulators for Heat Transfer Enhancement in a Solar Air Heater

Cited by 53 publications

References 33 publications

Heat transfer and flow field in a circular twisted channel

Heat transfer and flow field in a circular twisted channel

Experimental and numerical analysis of forced convection in a twisted tube

Heat and Fluid Flow Analysis and ANN-Based Prediction of A Novel Spring Corrugated Tape

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