Study of solar air heater with discrete arc ribs geometry: Experimental and numerical approach

Azad, Rajnish; Bhuvad, Sushant Suresh; Lanjewar, Atul

doi:10.1016/j.ijthermalsci.2021.107013

Cited by 35 publications

(4 citation statements)

References 43 publications

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“…Experimental investigation was conducted with arc rib with multiple gap roughness geometry [19] and came to conclude that the performance of arc rib with multiple gaps is better than continuous arc geometry [16] and broken arc shaped rib geometry [18]. Novel discrete symmetrical arc rib geometry was experimentally investigated with the aspect ratio W/H as 8 [20]. Symmetrical gap arc geometry and staggered element [21] shows better enrichment in Nu and f in comparison of an arc rib with multiple gap roughness geometry [19].…”

Section: Greekmentioning

confidence: 99%

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Singha,

Lanjewara

2024

Archives of Thermodynamics

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This study aims to investigate and compare the thermal performance of a solar air heater using a passive technique to enhance heat transfer between the absorber plate and the flowing fluid. The technique involves generating turbulence near the heat transferring surface through the use of artificial rib roughness. The study focuses on two different novel roughness geome-tries: full symmetrical arc rib roughness and half symmetrical arc rib roughness. By introducing additional gaps and varying the number of gaps in the roughness geometries, the study examines their effects on the solar air heaters thermal performance. The artificially roughened surface creates different turbulent zones, which are essential to the development of different types of turbulence in the vicinity of the heat transferring surface. The study finds that an optimal escalation in Nusselt number and friction factor by 2.36 and 3.45 times, respectively, occurs at certain gap numbers as 6 and ng as 5 for full symmetrical arc rib roughness. The maximum thermal-hydraulic performance parameter of 1.66 is attained at a Reynolds number of 6 000. The study also conducts correlation, mathematical modeling, and performance prediction under different operating circumstances.

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Section: Greekmentioning

confidence: 99%

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Singha,

Lanjewara

2024

Archives of Thermodynamics

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“…The details of the accuracy of the devices are given in the Table 1. An uncertainty analysis is performed to ascertain the standard error in the measurement of the mass flow rate and thermal efficiency [42][43][44].…”

Section: Uncertainties In Measurementmentioning

confidence: 99%

Thermohydraulic Efficiency of a Solar Air Heater in the Presence of Graded Aluminium Wire Mesh—A Combined Experimental–Numerical Study

2023

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In this work, aluminium wire mesh (WM) samples with 3, 9, and 18 pores per inch (PPI) and porosities of 0.894, 0.812, and 0.917, respectively, were combined together to form graded structures including 3-9-18, 9-18-3, and 18-3-9 PPIs. A 5 mm thickness for each WM was considered for a length of 2 m and inserted into a single-pass solar air heater (SAH) in which the height of the SAH was 120 mm. For the numerical analysis, a 3D numerical model was considered in ANSYS fluent software, and the Rosseland radiation model renormalization group (RNG) k-ε enhanced wall function was incorporated to account for solar radiation. The local thermal equilibrium (LTE) model was considered to obtain the heat-transfer characteristics of the WM. The numerical results of the thermohydraulic performance parameter (THPP) of the 9-18-3 PPI WM were 13.04% and 11.92% higher than the 3-9-18 and 18-3-9 PPI samples, respectively. Later, 25% of the 9-18-3 graded wire mesh (GWM) was considered at four different locations, i.e., 0, 0.5, 1, and 1.5 m away from the inlet, and analysed to obtain the best location for efficient heat transfer. The computational results show that 1.5 m away from the inlet is the best location among the different locations considered. The experimental results of the GWM at 1.5 m away from the inlet demonstrated a 20.91% and 23.32% increase in thermal efficiency compared to the empty channel for the 0.027 kg/s and 0.058 kg/s mass flow rates, respectively. From numerical-cum-experimental analysis, it was found that inserting 25% length of GWM of the entire length of the test section at a distance of 1.5 m from the inlet in single pass SAH improves the overall performance of the empty channel of single-pass SAH.

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“…The V-shaped configuration promotes the interaction of secondary flows with the main flow resulting in increased heat transmission. Azad et al 18 made use of discretely placed arc ribs that are symmetric in nature for the Reynolds number range of 3000–14,000 by varying the non-dimensional gap distance (2, 3, 4 and 5) for the normalised height of 0.045, normalised pitch of 10 and tilt angle of 30°. As compared to V-rib, discrete arc shaped rib has been shown to exhibit substantially greater effective performance with TEF value as high as 1.68 owing to higher turbulence levels created in the flow.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer augmentation of solar air heater using discrete transverse sinewave corrugations

Sankalp Shekar,

Nagaraj,

Mallashetty Shivamallaiah

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The influence of discretely placed sinewave corrugations on the effective thermal performance of the solar air heater system is presented using numerical methodology. The effect of forward and backward arrangement, normalised wavelength and amplitude on heat transfer enhancement is evaluated for different Reynolds number ranging between 6000 and 24,000. The non-dimensional wavelength and amplitude is varied as 0.0125–0.05 and 0.05–0.2 respectively while the non-dimensional pitch is taken as 1.875. The results show that the forward arrangement pattern of sinewave corrugation provides better thermo-hydraulic performance than the backward arrangement. For any given non-dimensional wavelength, lower non-dimensional amplitude exhibits greater thermal enhancement factor while for a fixed non-dimensional amplitude, the wavelength ratio of 0.025 provides greater thermal enhancement factor. The corrugation having amplitude ratio of 0.1 and wavelength ratio of 0.025 exhibits the highest thermal enhancement factor of 1.69 at Reynolds Number of 6000. It is also observed that, for Reynolds Number lesser than 9000, the configuration of amplitude ratio of 0.1 is found to exhibit higher thermal enhancement factor for any given non-dimensional wavelength. However, for Reynolds Number greater than 9000, the configuration of amplitude ratio of 0.05 is found to exhibit higher thermal enhancement factor for any given non-dimensional wavelength.

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Study of solar air heater with discrete arc ribs geometry: Experimental and numerical approach

Cited by 35 publications

References 43 publications

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Thermohydraulic Efficiency of a Solar Air Heater in the Presence of Graded Aluminium Wire Mesh—A Combined Experimental–Numerical Study

Heat transfer augmentation of solar air heater using discrete transverse sinewave corrugations

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