Thermal behavior in a solar air heater channel roughened with delta-shaped vortex generators

Baissi, Mohamed Tahar; Brima, Abdelhafid; Aoues, Kamel; Khanniche, R.; Moummi, Noureddine

doi:10.1016/j.applthermaleng.2019.03.134

Cited by 74 publications

(10 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Extensive research on baffled solar air heaters are delineated in the literature on various types of baffle turbulators, such as rectangular, 84,85 wavy, 82 delta wing shaped, 80,87,102 perforated, 86 V‐shaped, 9,81,86 inclined 79 and porous baffles 83 on heat transfer augmentation is reported by various investigators. It has been reported by Chabane et al 84 that the rectangular baffles can create strong local turbulence and provide better heat transfer between the collector and air.…”

Section: Thermal Performance Enhancement Techniquesmentioning

confidence: 99%

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

Chamarthi

Singh

2020

Intl J of Energy Research

View full text Add to dashboard Cite

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.

show abstract

Section: Thermal Performance Enhancement Techniquesmentioning

confidence: 99%

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

Chamarthi

Singh

2020

Intl J of Energy Research

View full text Add to dashboard Cite

show abstract

“…Kumar and Layek 25 assessed the effect of winglet turbulators on the thermal performance of a flat‐plate collector, and presented a relation for the performance of the collector based on the flow and winglet properties. Baissi et al 26 experimentally examined the effect of delta‐shaped turbulators on the thermal performance of flat‐plate collectors. Ghritlahre, Sahu 27 installed arch‐shaped roughness elements in flat‐plate collectors, and found that they increased heat transfer by 10% relative to a baseline collector.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal performance of humid air flow in a rectangular solar air heater equipped with V‐shaped ribs

Kadijani

Moghadam

Ajarostaghi

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

In this numerical work, heat transfer characteristics of humid air in a rectangular channel as solar air heater equipped with V-shaped ribs has been investigated. The impacts of geometrical parameters of proposed ribs such as height, pitch, and angle relative to air flow direction, as well as relative humidity and Reynolds number of inlet humid air on thermal performance of proposed solar air heater have been evaluated. The numerical results have been achieved using commercial Computational Fluid Dynamics (CFD) code, ANSYS FLUENT 18.2, which works based on finite volume method. Outcomes shows that, over a wide range of operating conditions, utilizing ribs cause thermal boundary layer to separate and reattach, and eventually enhance heat transfer rate. Increasing the rib angle produces stronger secondary flows, leading to higher local velocities and greater heat transfer rate. Moreover, increasing the relative humidity of inlet air from 0% to 50% leads to improve heat transfer by up to 6%. As Reynolds number increases from 4000 to 12,000, average Nusselt number rises by 7.3% and 31.4% for rib pitches of 6 and 16 mm, respectively. The results demonstrate how thermal performance of a solar air heater can be improved by utilizing V-shaped ribs.

show abstract

“…They also suggested that slotting and other techniques should be used at the rear of the fin to improve the coordination of the two fields. Baissi et al [ 21 ] investigated the HTP and energy loss of a SAH channel fitted with VGs experimentally. After analyzing the flow structure of perforated and non-perforated curved delta-shaped VGs, they found that the perforated VGs suffered relative lower pressure loss penalty, but the non-perforated delta-shaped VGs had a maximum TEF of 2.21.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigations of Micro Thermal Performance in a Tube with Delta Winglet Pairs

Wang

Zeng

et al. 2021

Micromachines

View full text Add to dashboard Cite

In this research, a novel vortex generator (VG) is presented. The experimental and numerical investigations were carried out to study the micro thermal-hydraulic performance in a heated tube. The numerical results showed that the fluid in the core flow region and the near-wall region was fully mixed because of the longitudinal vortices created by the vortex generators. In addition, the experimental results showed that the heat transfer coefficient (h) decreased with the increasing pitch ratio (PR) value, while the friction coefficient exhibited the opposite trend. With the increasing ration angle (RA) numbers, the h values decreased while the f numbers increased. In addition, the maximum and minimum values of the fraction ratio were 1.66 and 4.27, while these values of the Nusselt number ratio were 1.24 and 1.83. The maximum thermal enhancement factor (TEF) was 1.21 when PR = 0.5, RA = 0° and Re = 9090. The heat transfer enhancement mechanism of the vortex generator is explained from the microscopic point of view.

show abstract

Thermal behavior in a solar air heater channel roughened with delta-shaped vortex generators

Cited by 74 publications

References 44 publications

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

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

Hydrothermal performance of humid air flow in a rectangular solar air heater equipped with V‐shaped ribs

Numerical and Experimental Investigations of Micro Thermal Performance in a Tube with Delta Winglet Pairs

Contact Info

Product

Resources

About