Experimental investigation of heat transfer and friction factor characteristics of solar air heater using wavy delta winglets

Sawhney, J.S.; Maithani, Rajesh; Chamoli, Sunil

doi:10.1016/j.applthermaleng.2017.01.113

Cited by 125 publications

(19 citation statements)

References 19 publications

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“…Their study highlights the different mechanisms involved in the convective heat transfer intensification by generating multiple vortices using more aerodynamic VG shape while at the same time decreasing the pressure drop penalty. At latest R. Maithani et al [10][11] studied heat transfer and friction factor characteristics of solar air heater using wavy type delta winglets. Their Concluding comments are: the relative longitudinal pitch inversely affects the Nusselt number.…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental & Analytical Investigation of Heat Transfer Improvement by using Wavy Delta Winglet in Inline & Staggered Arrangement over Flat Plate

Pendharkar¹

2019

IJRASET

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Vortex generators are important heat transfer enhancers utilized now days to improve the performance of heat sinks. Wavy delta winglet is a novel vortex generator chosen for this study. In this study, experimental data for local heat transfer coefficients are presented for a plate with square cross section and wavy delta winglet vortex generators. Experiments are conducted to access turbulent forced convection heat transfer for air flow through a over a flat plate fitted with wavy delta winglet. Two arrangement namely in-line and staggered arrays, are checked. The flow rate is in terms Reynolds number based on hydraulic diameter of channel in range of 7000 to 24500. The analytical result shows a significant effect of presence of Wavy winglet on heat transfer rate over smooth flat plate.

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Section: Literature Reviewmentioning

confidence: 99%

Experimental & Analytical Investigation of Heat Transfer Improvement by using Wavy Delta Winglet in Inline & Staggered Arrangement over Flat Plate

Pendharkar¹

2019

IJRASET

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“…Available at www.ThermalFluidsCentral.org Frontiers in Heat and Mass Transfer (FHMT), 11, 10 (2018) DOI: 10.5098/hmt.11.10 Global Digital Central ISSN: 2151-8629 Sawhney et al (2017) experimentally investigated the pressure loss, heat transfer configuration and thermal performance in a solar air heater with wavy delta winglet. The number of wave (3, 5 and 7), Reynolds number (4000 -17,300), arrangement (inline and staggered) and relative longitudinal pitch (3, 4, 5 and 6) were varied.…”

Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

Numerical Predictions on Flow and Heat Transfer in Heat Exchanger Tube Equipped With Various Flow Attack Angles of Inclined-Wavy Surface

Jedsadaratanachai¹,

Boonloia²

2018

Frontiers in Heat and Mass Transfer

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Numerical analysis on flow configuration, heat transfer behavior and thermal performance in the heat exchanger tube equipped with various flow attack angles of the inclined wavy surface are presented. The laminar flow (Re = 100 -1200) and turbulent flow (Re = 3000 -10000) are considered for the present investigation. The flow attack angles of the inclined wavy surface are varied as 15 o -60 o . The finite volume method with SIMPLE algorithm is selected to evaluate the current problem. The numerical results are reported in terms of flow and heat transfer mechanisms. The performance evaluations in forms of the Nusselt number ratio (Nu/Nu 0 ), friction factor ratio (f/f 0 ) and thermal enhancement factor (TEF) are also concluded. As the results, the vortex flow, impinging flow and thermal boundary layer disturbance are detected when inserted the inclined wavy surface in the heat exchanger tube. These behaviors effect for the augmentation of the heat transfer rate, pressure loss and thermal performance. The optimum flow attack angle of the inclined wavy surface for the laminar and turbulent flows are also concluded.

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“…e effects of the perforation index and relative pitch length on heat transfer and thermal performance in the tested tube were considered for Re � 3000-21,000. ey found that the circular tube with perforated vortex generators provides the maximum thermal enhancement factor around 1.65. e multiobjective shape optimization of a heat exchanger tube fitted with compound inserts was reported by Chamoli et al [25]. Sawhney et al [26] experimentally examined the heat transfer and friction factor in a solar air heater duct with wavy delta winglets for the Reynolds number around 4000-17,300. e number of wave and relative longitudinal pitch for the wavy delta winglet was compared. ey claimed that the wavy delta winglet in the duct performs the heat transfer rate greater than the plain duct around 223%.…”

Section: Introductionmentioning

confidence: 99%

Thermohydraulic Performance Improvement in Heat Exchanger Square Duct Inserted with 45° Inclined Square Ring

Boonloi

Jedsadaratanachai

2020

Modelling and Simulation in Engineering

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Thermal performance development, heat transfer structure, and flow behavior in the heat exchanger square duct equipped with a 45° inclined square ring are investigated numerically. The effects of flow blockage ratios and spacing ratios for the inclined square ring on fluid flow and heat transfer are considered. The Reynolds number (Re = 100–2000, laminar regime) based on the hydraulic diameter of the square duct is selected for the present work. The numerical domain of the square duct inserted with the 45° inclined square ring is solved with the finite volume method. The SIMPLE algorithm is picked for the numerical investigation. The heat transfer characteristics and flow topologies in the square duct inserted with the inclined square ring are plotted in the numerical report. The heat transfer rate, pressure loss, and efficiency for the square duct placed with the inclined square ring are presented in forms of Nusselt number, friction factor, and thermal enhancement factor, respectively. As the numerical results, it is detected that the heat transfer rate of the heat exchanger square duct inserted with the inclined square ring is around 1.00–10.05 times over the smooth duct with no inclined square ring. Additionally, the maximum thermal enhancement factor for the heat exchanger square duct inserted with the inclined square ring is around 2.84.

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Experimental investigation of heat transfer and friction factor characteristics of solar air heater using wavy delta winglets

Cited by 125 publications

References 19 publications

Experimental & Analytical Investigation of Heat Transfer Improvement by using Wavy Delta Winglet in Inline & Staggered Arrangement over Flat Plate

Experimental & Analytical Investigation of Heat Transfer Improvement by using Wavy Delta Winglet in Inline & Staggered Arrangement over Flat Plate

Numerical Predictions on Flow and Heat Transfer in Heat Exchanger Tube Equipped With Various Flow Attack Angles of Inclined-Wavy Surface

Thermohydraulic Performance Improvement in Heat Exchanger Square Duct Inserted with 45° Inclined Square Ring

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