Experimental investigation of solar air heater with new symmetrical GAP ARC GEOMETRY and staggered element

Ambade, Jaigopal; Lanjewar, Atul

doi:10.1016/j.ijthermalsci.2019.106093

Cited by 36 publications

(37 citation statements)

References 42 publications

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“…Comparison of Nu and f of gaps and staggered ribs in symmetrical arc rib roughness with the best arc rib roughness geometry by Ambade and Lanjewar. 33 The development of a correlation between the roughness function (R), roughness Reynolds number (e + ), and the heat transfer function (G#), roughness Reynolds number (e + ). Examines the proposed roughness geometry namely discrete symmetrical arc-rib with staggered rib, symmetrical arc geometry with a staggered element by Ambade and Lanjewar 33 and smooth SAH in terms of efficiency against economics.…”

Section: Objective Of Present Studymentioning

confidence: 99%

“…Outcomes of experimental investigations of discrete symmetrical arc rib with staggered rib geometry and available best arc rib geometries as listed in Table 2 were compared under similar operating conditions. The roughness geometries of Jain et al 32 and Ambade and Lanjewar 33 were refabricated independently on the absorber plate with optimal parameters declared in literature to maintain the similar flow pattern. Similar environmental operating conditions were provided for roughness geometries of 32,33 and for present study.…”

Section: Comparison Of Present Geometry With Available Best Arc Rib G...mentioning

confidence: 99%

“…Symmetrical arc geometry with a staggered element was investigated by Ambade and Lanjewar. 33 The present experimental investigation was conducted with small diameter ribs as turbulence generators on the absorber surface for augmenting thermal performance in SAH. The following preceding can be established from a rigorous analysis of the available literatures.…”

Section: Introductionmentioning

confidence: 99%

“…It is therefore important to conduct an experimental analysis of an additional gap in the present study and compare its performance to that of the optimal arc rib geometry namely symmetrical arc geometry with a staggered element by Ambade and Lanjewar. 33 It will indeed be a novelty if performance is better than providing additional gap. In order to fill this research gap, it is necessary to investigate the impact of an additional gap on the continuous arc segment of best arc rib geometry of Ambade and Lanjewar.…”

Section: Introductionmentioning

confidence: 99%

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Thermal performance of solar air heater having discrete symmetrical arc rib with staggered rib roughness

Singh

Lanjewar

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper investigates physics of forced flow underneath the absorber plate in solar air heater (SAH) integrated with new arc geometry namely discrete symmetrical arc rib with staggered rib roughness. This article signifies the impact of roughness pitch relative to rib height (p/e) on the thermal performance of rectangular roughened SAH duct having discrete symmetrical arc rib with staggered rib (present study). Novel arc rib geometry (present study) is achieved by providing an additional gap in a significantly long continuous arc segment of existing best arc rib geometry to break the boundary layer reformation along it. Range of parameters considered for experimental run for new geometry were Reynolds number (Re) as 3000–15,000, roughness pitch relative to rib height (p/e) of 6–14, flow attack angle (α) of 30°, staggered rib pitch relative to roughness pitch (p′/p) of 0.4, number of symmetrical gap over full arc (Ng) as 6, number of additional gap in symmetrical arc elements (ng) as 5, gap width relative to rib height (g/e) as 3, rib height relative to hydraulic diameter (e/Dh) as 0.043, relative gap position (d/w) and additional gap width relative to rib height (g′/e) as 0.65 and 1 respectively. Five different roughened test plate with the variation of p/e as 6, 8, 10, 12, and 14 were tested. Optimum augmentation is perceived in Nu at p/e as 10 and for f at p/e as 8. Maximum thermo-hydraulic performance parameter (THPP) is achieved at p/e as 10 that corresponds to Re as 6000. Correlation, mathematical model, performance prediction and economic evaluation have also been done under different operation conditions.

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Section: Objective Of Present Studymentioning

confidence: 99%

Section: Comparison Of Present Geometry With Available Best Arc Rib G...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal performance of solar air heater having discrete symmetrical arc rib with staggered rib roughness

Singh

Lanjewar

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The increase in Nu and friction factor value was estimated to be 2.16 and 15.95, respectively, at a baffle blockage ratio of 0.7. Ambade and Lanjewar 33 tested a new symmetrical gap arc shape with a staggered element on SAH. They concluded that significant Nu and friction factor rises were 2.18 and 3.88 for a relative rib pitch of 10 mm, respectively.…”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analysis of solar air heater with trapezoidal ribs based absorber: A comparative analysis

Gogada

Roy

Gupta

et al. 2022

Energy Science & Engineering

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The performance of a solar air heater (SAH) is computationally investigated in this study using COMSOL multiphysics software. The present study aims to enhance the performance of smooth SAH with the help of artificial roughness. To achieve the goal, trapezoidal ribs above (Model 1) and below (Model 2) the absorber were fixed. The thermo‐hydraulic characteristics of smooth SAH were compared with the thermo‐hydraulic performances of Model 1 and Model 2. The computations were made by varying the heat flux between 600 and 1000 W/m2, Reynolds number from 4000 to 7000, relative rib height (h/H) from 0.2 to 0.7, and a constant pitch of 15 mm. The maximum enhancement in Nusselt number (Nu) compared to smooth duct was 5.54 times for Model 1 and 5.42 times for Model 2 at a h/H = 0.7 at Re = 7000. The maximum increase in friction factor was 36.97 times more than the smooth duct. The thermal performance factor (TPF) at 1000 W/m2 ranged from 1.29 to 1.72 for Model 1 and 1.27 to 1.68 for Model 2. It is found that trapezoidal ribs of Model 1 with h/H of 0.6 has delivered a maximum TPF of 1.72 at Re = 7000. The optimized relative rib height was found to be 0.6. The maximum exergy efficiency of 10.40% was obtained for Model 1 with h/H of 0.6 and at 1000 W/m2.

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Compound passive heat transfer augmentation techniques: A comprehensive review

Al‐Chlaihawi,

Hasan,

Ekaid

2023

Heat Trans

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The function of energy is becoming increasingly vital in meeting the requirements of modern societies and sustaining rapid economic and industrial growth globally. Heat transfer equipment has been employed for heat recovery and conversion in various domestic and industrial applications. Therefore, due to the recent global energy crisis, boosting the thermal efficiency of energy systems has become an essential requirement, which would reduce both their size and rates of energy demand. There are active and passive methods for boosting heat transfer rates. As they have no moving components, passive methods are more affordable and dependable than active ones. Applying two or more passive techniques concurrently will result in a higher heat transmission rate than any approach working independently. The current article comprehensively reviews experimental and computational investigations of passive compound forced convection heat transfer augmentation techniques at laminar, transition, and turbulent flow regimes. This article focuses on compound techniques arrangement in the form of turbulators, typical twisted tapes (TTs), surface roughness, vortex generators, and so on. The pioneering research suggests that using a lower twist ratio, lower pitch, and smaller winglet angles in TTs can result in higher heat transfer rates, albeit with a slightly increased friction factor. The combination of alternate‐axes and wings in TTs leads to more effective heat transfer enhancement within the tube.

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Experimental investigation of solar air heater with new symmetrical GAP ARC GEOMETRY and staggered element

Cited by 36 publications

References 42 publications

Thermal performance of solar air heater having discrete symmetrical arc rib with staggered rib roughness

Thermal performance of solar air heater having discrete symmetrical arc rib with staggered rib roughness

Energy and exergy analysis of solar air heater with trapezoidal ribs based absorber: A comparative analysis

Compound passive heat transfer augmentation techniques: A comprehensive review

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