Experimental study on turbulent flow and heat transfer in an air to water heat exchanger using perforated circular-ring

Sheikholeslami, M.; Gorji-Bandpy, M.; Ganji, D.D.

doi:10.1016/j.expthermflusci.2015.09.002

Cited by 76 publications

(22 citation statements)

References 13 publications

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“…Ary et al [20] investigated the effect of number of holes on the thermal-hydraulic characteristics and they reported that two perforated baffles perform better that one baffle. The thermal efficiency may be increased with the rise of number of holes in perforated circular rings, as reported by Sheikholeslami et al [21].…”

Section: Introductionsupporting

confidence: 52%

Numerical investigation of the performance of perforated baffles in a plate-fin heat exchanger

2021

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Tel: +213 770343722The present paper is a numerical investigation on the performance of perforated baffles in a plate-fin heat exchanger. Two types of perforations are studied, namely the circular and elliptical shapes. Values of heat transfer coefficient, pressure drop and thermal performance factor are determined for both cases and compared with those for a smooth channel. Also, the flow fields and heat transfer characteristics are determined for different fluids and various Reynolds numbers. The working fluids are complex, non-Newtonian and have an inelastic shear thinning behavior. The obtained results showed a good enhancement in the thermal performance factor by the suggested design in baffles. In the case of low viscous fluids, the elliptical perforated baffle performs better (by about 63.4%) than the circular one for all values of Re. But for highly viscous fluids, the elliptical perforation shows higher thermal performance than the circular hole by about 25% for low Re and 27% for high Re. The overall thermal performance factors are about 1.55 and 1.74 for the circular and elliptical perforations, respectively.

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Section: Introductionsupporting

confidence: 52%

Numerical investigation of the performance of perforated baffles in a plate-fin heat exchanger

2021

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“…The authors reported that the lowest pitch and diameter ratios offer the highest heat transfer rate. Sheikholeslami et al examined heat transfer characteristics in annuli using circular‐ring and perforated circular‐ring turbulators at various pitch ratios for Reynolds numbers varying between 6000 and 12 000. The thermal performance was found to improve with the increase of number of holes in the turbulators and decreases with higher Reynolds number and pitch ratio.…”

Section: Introductionmentioning

confidence: 99%

“…The studies are made using air as working fluid through the tubes and the DPHE. Studies have been reported for various pitch ratios (0.5–12) and diameter ratios in the range of 0.31–0.69 , . The thermal performance of turbulators at various pitch ratios and diameter ratios are limited in the literature.…”

Section: Introductionmentioning

confidence: 99%

Effect of Helical Surface Disc Turbulators on Heat Transfer and Friction Factor Characteristics in the Annuli of a Double‐Pipe Heat Exchanger

Yadav

Sahu

2019

Chem Eng & Technol

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The heat transfer and pressure drop characteristics in annuli of a double-pipe heat exchanger (DPHE) using helical surface disc turbulators (HSDTs) are experimentally investigated. The effect of a helical surface disc turbulator is studied for three pitch ratios, three diameter ratios, and varying Reynolds numbers. Water flows in the inner tube and air through the annulus. The tests are conducted for air with uniform wall temperature condition. The heat exchanger with the least pitch ratio and least diameter ratio was found to exhibit the highest Nusselt number and pressure drop. The thermal performance factor turned out to be greater than unity for all cases. Correlations were developed for Nusselt number, friction factor, and thermal performance.

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“…Using different fluids in heat exchangers allows an evaluation of the performance of the heat exchanger. This involves looking at the cooling process and the temperature difference, and deriving correlations between the concentration and flow, and the boiling temperature [8][9][10][11][12][13]. Examination of the thermal and dynamic analysis of plate-type heat exchangers has been performed using computational fluid dynamics (CFD) programs, and analytical studies using numerical calculations that have been used to investigate the thermal conductivity of heat exchangers have been reviewed in published literature.…”

Section: Introductionmentioning

confidence: 99%

“…A range of different channel angles have been investigated to show the effect of surface area on heat transfer. The heat transfer and heat transfer coefficient has been examined with important parameters, such as the Reynolds number and the Nusselt number, and taken into account in the design of heat exchangers [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Examination of Different Heat Exchangers and the Thermal Activities of Different Designs

2017

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In this study, instead of gasketed or brazed plate heat exchangers, which are used in various fields of application, a direct metal sintering method is used to design a heat exchanger with its original geometry and with different geometries. Studies of heat exchangers found in published literature were reviewed, and the thermal behaviors of the proposed unique designs were examined. Usually heat exchangers using this design do not use channel spacing angles of 30-45-60-75• for the plate ducts. The thermal behaviors of the fluid-circulating systems were analyzed using ANSYS FLUENT software, and they used the boundary conditions found in the literature for this design. Heat transfer between the heat exchanger channels and channel walls was calculated. The analyses results show that an increase in the amount of heat transfer surface area and also an increase in surface roughness increased the amount of positive heat transfer.

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Experimental study on turbulent flow and heat transfer in an air to water heat exchanger using perforated circular-ring

Cited by 76 publications

References 13 publications

Numerical investigation of the performance of perforated baffles in a plate-fin heat exchanger

Numerical investigation of the performance of perforated baffles in a plate-fin heat exchanger

Effect of Helical Surface Disc Turbulators on Heat Transfer and Friction Factor Characteristics in the Annuli of a Double‐Pipe Heat Exchanger

Examination of Different Heat Exchangers and the Thermal Activities of Different Designs

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