Prediction of behavior of triangular solar air heater duct using V-down rib with multiple gaps and turbulence promoters as artificial roughness: A CFD analysis

Misra, Rohit; Singh, Jagbir; Jain, Sheetal Kumar; Faujdar, Sachin; Agrawal, Muskan; Mishra, Arin; Goyal, Pradeep

doi:10.1016/j.ijheatmasstransfer.2020.120376

Cited by 70 publications

(25 citation statements)

References 29 publications

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“…In the present investigation, the passive method is selected to extend the heat transfer potentiality of the heat exchanger duct (HED). As the previous works [14][15][16][17][18][19], we found that the V-shaped baffle/rib gives high efficiency to augment heat transfer rate and thermal performance. However, the installation of the V-shaped baffle/rib in the heating duct has a problem about the stability of the vortex generator.…”

Section: Introductionsupporting

confidence: 78%

Impacts of Double V-Rings in the Heat Exchanger Duct on Heat Transfer and Flow Behaviors: A Numerical Study

Boonloi

Jedsadaratanachai

2021

Mathematical Problems in Engineering

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The impacts of the double V-rings (DVR) in the heat exchanger duct (HED) on heat transfer and flow structures are numerically analyzed. The general configuration of the DVR is called “type I,” while the discrete DVR can be split into two structures, which are called “types II and III.” The influences of the DVR sizes, DVR types and flow directions on heat transfer rate, friction loss, and thermohydraulic performance are considered. The Reynolds numbers in the range around 100–2000 (laminar regime at the entrance condition) are selected for the present investigation. The numerical problem of the HED installed with the DVR is solved with the finite volume method (a commercial code). The flow structure, heat transfer mechanism, and performance analysis in the HED that fitted the DVR are reported. The flow and heat transfer profiles in the HED fitted with the DVR are an important knowledge to develop the thermohydraulic performance of compact heat exchangers. As the numerical results, it is seen that the heat transfer ability of the tested duct improves around 1.05–16.62 times upper than the smooth duct. Additionally, the greatest value of the thermal enhancement factor in the HED fitted with the DVR is seen to be around 4.17 at a/H = 0.025, b/H = 0.10, Re = 2000, and V-upstream direction for the type I.

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Section: Introductionsupporting

confidence: 78%

Impacts of Double V-Rings in the Heat Exchanger Duct on Heat Transfer and Flow Behaviors: A Numerical Study

Boonloi

Jedsadaratanachai

2021

Mathematical Problems in Engineering

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“…The study of V-ribs and V-down ribs with multiple gaps for triangular solar air heater duct enhanced Nusselt number and friction factor over the smooth duct due to reattachments and generation of secondary flow vortices. 148,149 Moreover, the V-down ribs with multiple gaps and turbulators shown better thermo-hydraulic performance, which is of 2.04 compared to the other roughness geometry for triangular cross-sectional ducts so far studied. Similarly, the study conducted by Singh 150 on V-down ribs attached to the bottom side of the absorber plate carried with external recycle for both semicircular duct and triangular duct, as shown in Figure 12 yielded thermo-hydraulic efficiency of 73% and 71%, respectively.…”

Section: Duct Modificationsmentioning

confidence: 97%

A comprehensive review of experimental investigation procedures and thermal performance enhancement techniques of solar air heaters

Chamarthi

Singh

2020

Intl J of Energy Research

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This review composition aimed to comprehensively present the experimental investigation procedures and thermal performance augmentation techniques of solar air heaters. Various testing standards such as static and dynamic tests, and performance parameters, such as, thermal, thermo-hydraulic, and exergy efficiencies, are incorporated to present the experimental investigation procedures. The present review work deals with testing conditions (indoor and outdoor), instrumentation, various parameters of interest with corresponding optimum values, their uncertainty levels together with SAH orientation, air flow type, thermal energy storage devices, duct modifications and heat transfer surfaces using fins, baffles, and ribs employed to enhance the thermal performance. The authors of this review work believed that the current composition constitutes a summary of details to quickly access the information for analyzing the various experimental investigation procedures and heat transfer augmentation techniques along with the optimum values of flow and geometric parameters. Moreover, economical and efficient solar air-heating systems with low pressure drop and high heat exchange to air are presented and reviewed.

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“…The heat transfer potentiality of the TSD is presented by local Nusselt number and average Nusselt number as Equations ( 9) and (10), respectively.…”

Section: Continuity Equationmentioning

confidence: 99%

“…They summarized that the augmented heat transfer is around 28.3% when increasing the rib height from 2.5 to 7.5 mm for the rib pitch of 50 mm. Misra et al [10] reported the CFD analysis for a triangular solar air heater duct using V-down ribs with multiple gaps and turbulence promoters. Jin et al [11,12] improved the thermal performance of a solar air heater by using multiple V-shaped ribs.…”

Section: Introductionmentioning

confidence: 99%

Case Studies on Enhanced Heat Transfer in a Square Duct with Modified V-Shaped Ribs (MVR): A CFD Analysis

Boonloi

Jedsadaratanachai

2022

Modelling and Simulation in Engineering

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This research presents structural improvement of V-shaped ribs for a tested square duct (TSD). The V-shaped ribs, which are inserted at the middle of the TSD (called type A), and the V-shaped ribs, which are placed on the opposite TSD walls (called type B), are modified to increase the structural stabilization. The effects of rib height to duct height, b / H = 0.05 – 0.30 ; V-shaped bar thickness to duct height, a / H = 0.025 and 0.050; and flow directions (V-Upstream and V-Downstream) are considered. The new design of the V-shaped ribs is called “modified V-shaped ribs or MVR.” The present problem is solved by the numerical method (commercial code). The flow and heat transfer features of the TSD are illustrated. The numerical result reveals that the MVR give both flow and heat transfer patterns similarly as the general V-shaped rib. The impinging flows, swirling flows, and disturbing thermal boundary layer, which lead to enhanced heat transfer, are observed. Over the investigated range, the enhanced heat transfer about 18.12 times above the smooth duct with the optimal thermal enhancement factor about 4.16 is detected.

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Prediction of behavior of triangular solar air heater duct using V-down rib with multiple gaps and turbulence promoters as artificial roughness: A CFD analysis

Cited by 70 publications

References 29 publications

Impacts of Double V-Rings in the Heat Exchanger Duct on Heat Transfer and Flow Behaviors: A Numerical Study

Impacts of Double V-Rings in the Heat Exchanger Duct on Heat Transfer and Flow Behaviors: A Numerical Study

A comprehensive review of experimental investigation procedures and thermal performance enhancement techniques of solar air heaters

Case Studies on Enhanced Heat Transfer in a Square Duct with Modified V-Shaped Ribs (MVR): A CFD Analysis

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