Numerical investigation on heat transfer enhancement of solar air heater using sinusoidal corrugations on absorber plate

Manjunath, M; Karanth, K. Vasudeva; Sharma, Neha

doi:10.1016/j.ijmecsci.2018.01.037

Cited by 108 publications

(30 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Heat extraction enhances the performance and reduces the overall heat loss to the environment. Manjunath et al, (2018) explained that the presence of V-groove corrugation provides higher flow disturbances leading to a significant enhancement in heat transfer in addition to an increased surface area for convective heat transfer. Fig.…”

Section: Design and Cfd Simulation Analysismentioning

confidence: 99%

Performance Analysis of Flat-Plate and V-groove Solar Air Heater Through CFD Simulation

Desisa

Shekata

2020

Int. J. Renew. Energy Dev.

View full text Add to dashboard Cite

The simplicity of solar flat plate air collector and freely availability of solar energy sources attracts attention to collector optimization. This study aims to evaluate the effect of double pass airflow on the performance of flat plate air collectors. Indirect type solar dryer performance characteristics analysis was done through CFD simulation with three different shapes (smooth, rough, and V-grooved) keeping the collector insulated and drying chamber act as a vertical chimney. The average thermal efficiency of the V-grooved surface, smooth surface, and rough surface is 90%, 78%, and 62% respectively. The total area of the collector is 1.20 * 2.0 = 2.60 m2 with the drying cabinet 1.20 * 0.65 * 1.00 m (width * depth * height) and 0.005m thick glass cover. Observed pressure drop at the inlet of the drying chamber is high in the case of smooth surface, medium in a rough surface, and low in a v-grooved plate that will allow enough gas pressure to pass through all the compartment of the process at full-scale. The air mass flow rate is the most important and effective factor during drying. The humidity of the air, as well as air velocity, is also an important factor for improving the drying rate.

show abstract

Section: Design and Cfd Simulation Analysismentioning

confidence: 99%

Performance Analysis of Flat-Plate and V-groove Solar Air Heater Through CFD Simulation

Desisa

Shekata

2020

Int. J. Renew. Energy Dev.

View full text Add to dashboard Cite

show abstract

“…S-shaped baffles [9] have also been reported to enhance heat transfer considerably through turbulence augmentation. Use of corrugated absorber plate has also been reported such as sinusoidal corrugation [10], V-corrugation [11] and slitperforated corrugation [12]. The sinusoidal corrugation achieved an increase of about 12.5% thermal efficiency as compared to smooth duct owing to significant flow disturbances underneath the absorber plate due to corrugations.…”

Section: Introductionmentioning

confidence: 96%

CFD analysis for thermal performance augmentation of solar air heater using deflector ribs

Venkatesh

Kumar

Madhwesh

et al. 2020

JMES

View full text Add to dashboard Cite

This paper presents the effect of deflector ribs on the thermal performance of flat plate solar air heater using Computational Fluid Dynamics (CFD) methodology. The analysis is carried out using two-dimensional computational domain for the Reynolds number range of 6000-18000. RNG k-є turbulence model is used to capture the turbulence characteristics of the flow. The deflector rib has a cross-section of isosceles triangle and is placed transversely with respect to the flow. The distance between consecutive ribs is varied as 40mm, 80mm, 160mm and 320mm while the air gap height is varied as 2mm, 3mm, 5mm and 10mm. The numerical model is validated against the well-known correlation of Dittus-Boelter for smooth duct. The simulation results reveal that the presence of deflector ribs provide augmented heat transfer through flow acceleration and enhanced turbulence levels. With reference to smooth duct, the maximum achieved heat transfer improvement is about 1.39 times for the inter-rib distance of 40mm and an air gap height of 3mm while the maximum fiction factor achieved was about 3.82 times for pitch value of 40mm and air gap height of 3mm. The highest thermal enhancement factor is achieved for the pitch value of 320mm and an air gap height of 3mm at Re=6000. The air gap height value of 10mm exhibits thermal enhancement factor values lesser than 1.0 and hence is not recommended for use as heat transfer enhancement device for the entire Reynolds number range used in the analysis. The pitch value of 320 mm exhibits thermal enhancement factor greater than 1.0 for almost all the Reynolds number range used in the analysis and varies between 0.93 and 1.07.

show abstract

“…The CFD results revealed the formation of vortices at the turning points of the helical path which resulted in enhanced fluid mixing as well as higher pressure drop. The results showed that the thermal efficiency is about 14.7% higher than the smooth duct and about 8.6% higher than the double pass solar air heater with fins for the same flow rate conditions Manjunath et al (2018). have shown that the sinusoidal corrugations on the absorber plate as shown inFigure 14could provide significant flow disturbances which leads to higher levels of turbulence intensity.…”

mentioning

confidence: 92%

A Review of CFD Investigations on Heat Transfer Augmentation of Forced Convection Solar Air Heater through Enhanced Fluid Turbulence Levels

Manjunath

Madwesh

2019

IJMPERD

View full text Add to dashboard Cite

Solar air heaters generally exhibit lower levels of thermal performance due to higher heat losses and poor heat transfer characteristics of air which is the working fluid. Many investigations, both experimental and numerical, have been carried out in the past to overcome these limitations. One of the commonly used techniques for thermal performance enhancement in solar air heaters is to enhance the turbulence levels in the flowing air stream. This paper presents a detailed review of investigations involving numerical studies for thermal performance enhancement of solar air heater by enhancing turbulence levels in the air flow. It is observed that the focus of numerical simulation studies has been on the use of artificial roughness elements, corrugations and vortex generators to achieve higher turbulence levels in the air flow. RNG k-e turbulence model has been commonly used to capture the turbulent flow characteristics. An attempt has also been made to summarize the operating parameters and heat transfer enhancement parameters of various numerical simulation studies done in the past with respect to turbulence enhancement technique.

show abstract

Numerical investigation on heat transfer enhancement of solar air heater using sinusoidal corrugations on absorber plate

Cited by 108 publications

References 24 publications

Performance Analysis of Flat-Plate and V-groove Solar Air Heater Through CFD Simulation

Performance Analysis of Flat-Plate and V-groove Solar Air Heater Through CFD Simulation

CFD analysis for thermal performance augmentation of solar air heater using deflector ribs

A Review of CFD Investigations on Heat Transfer Augmentation of Forced Convection Solar Air Heater through Enhanced Fluid Turbulence Levels

Contact Info

Product

Resources

About