Experimental investigation of heat transfer from different pin fin in a rectangular channel

Çalışkan, Sinan; Doğan, Ayla; Kotcioğlu, İsak

doi:10.1080/08916152.2018.1526228

Cited by 26 publications

(6 citation statements)

References 22 publications

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“…To analyze the influence of the axial heat conduction in the cooler, Equations (1)- (14) are used to establish a model for Normal. When the axial heat conduction is not considered; in other words, the axial heat conduction in the energy Equations (6) and (14) are ignored, a model for Non-axial conduction is established. When the model is calculated under different pressures, the temperature and pressure changes of the HPF and LPF are as illustrated in Figures 22 and 23.…”

Section: Influence Of Axial Heat Conductionmentioning

confidence: 99%

“…Heat leakage is mainly caused by heat transfer between the cooler and the environment, including heat radiation and heat convection. When the heat leakage is not considered, Q s and Q c are removed from energy Equations (6) and (14) of the Normal model to establish the Non-heat leakage model. Figure 25 shows a diagram of the pressure distribution of HPF and LPF along the path of the Normal and Non-heat leakage models at 5.40 MPa, which indicates that the pressure drops of the HPF and LPF of the two models coincide basically.…”

Section: Influence Of Heat Leakagementioning

confidence: 99%

“…5 However, with the development of ultra-large-scale integrated electronics, a more compact structure and larger cooling capacity are required for electronic cooling equipment. 6 The conventional Hampson-type J-T cooler, as shown in Figure 1, has a large supporting mandrel in the middle, which makes the cooler structure noncompact. The heat transfer coefficient between the inflow in the spiral inlet tube and the backflow in the gap between the shell and tube is also low.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical analysis of the multilayer distributed Joule‐Thomson cooler with pillars

Geng

Cui

She

et al. 2020

Intl J of Energy Research

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The conventional Joule-Thomson cooler is not compact in heat exchanger and insufficient in cooling capacity, which is limited in applying integrated electronics. However, microchannels with pillars are effective in increasing the area to volume ratio and enhancing heat transfer through the presence of vortex. Besides, multilayer microchannels are essential to enlarge the mass-flow rate in the cooler. In this study, a multilayer distributed J-T cooler with pillars is investigated. A new mathematical model of the cooler is developed and validated against the experimental data; the relative errors of the temperature and mass-flow rate are both within 5%. Furthermore, the distribution of temperature and pressure in the microchannel is analyzed by the model calculation. Numerical results show that the temperature of the high-pressure fluid decreased slightly under the influence of the heat exchange and distributed J-T effect. When the inlet pressures are 3.00, 4.00 and 5.40 MPa, the cold-end temperatures are 233.0, 185.8 and 161.2 K, respectively, with the cooling capacity reaching 2.25, 3.40 and 3.87 W, respectively. In addition, the influences of the axial heat conduction and heat leakage on the cooling performance are analyzed by using the models. The temperature rise of the cold end increases by 6.8 and 6.2 K at 5.40 MPa, respectively, considering the above two factors. The simulation model provides a useful tool for the J-T cooler.

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Section: Influence Of Axial Heat Conductionmentioning

confidence: 99%

Section: Influence Of Heat Leakagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical analysis of the multilayer distributed Joule‐Thomson cooler with pillars

Geng

Cui

She

et al. 2020

Intl J of Energy Research

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“…Caliskan et al. 16 investigated the effect of hexagonal pin fins and cylindrical pin fins fitted into a rectangular channel on heat transfer and friction factor experimentally. The maximum heat transfer performance corresponds to the hexagonal pin fins.…”

Section: Introductionmentioning

confidence: 99%

Thermo-hydraulic performance of modified plate fin and pin fin heat sinks

Patil

Choudhary

Gupta

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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Extended surfaces are widely investigated for their ability to enhance the heat transfer rates in different applications. Pin-fin and plate-fin heat sinks are used in a variety of cases involving a miniaturized to the large systems. The present study compares the performance of the pin-fin and the plate-fin heat sink under similar forced flow conditions. The experimental data for a modified pin fin heat sink with wings and a plate-fin heat sink with dimples are collected for the Reynolds number in the range of 6800–15100. The Nusselt number, friction factor, and thermo-hydraulic performance (THP) are examined for different geometries of the heat sink and the enhancements brought out in the heat transfer and friction are gauged relative to the smooth plate. The pin fin heat sink yields two-fold enhancement in heat transfer as compared to the plate-fin heat sink. The maximum thermo-hydraulic performance of the pin-fin heat sink with wings is found to be 4.52 at a pitch ratio (S/Df) of 2 and Wing length ratio (Lw/Df). For the plate fin heat sink with dimples, the maximum thermo-hydraulic performance is found to be 4.67 at dimple diameter ratio (D/d) of 0.5 and dimple pitch ratio (s/d) of 2.5. The correlations of the Nusselt number and friction factor are proposed for different geometries of fins.

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“…It was observed that the heat transfer enhancement with vertically oriented bases was higher than horizontally oriented bases for fin arrays of the same geometry. Sinan Caliskan et al [5] experimentally investigated the effect of hexagonal and cylindrical pin fins into the rectangular channel. The experiments were conducted with different fin geometry, fin array, Reynolds number and ratio of fin spacing and its hydraulic diameter.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Heat Transfer Characteristics using Aerofoil Fin over Square and Circular Fins

Shrirao*¹,

Sambhe²

2019

IJRTE

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The thermal conductivity of fin material, its geometrical profile and the mode of heat transfer etc, are the key factors which generally affects the heat transfer from fins. The present research deals with the improvement in heat transfer characteristics and the investigation of fin performance efficiency by using fins of varying geometrical profiles in pin fin apparatus. In this study the heat transfer characteristics inside a rectangular duct with circular, square and aerofoil geometrical profiles of fins were analyzed experimentally. The intention of the present work is to evaluate the heat transfer coefficient, Reynolds number, Nusselt number, pressure drop and efficiency of fin with circular, square and aerofoil geometrical profiles and all the results obtained will be compared with those from a circular fin of same material surface. In the present study, experimental results of the heat transfer characteristics of all the three geometrical profiles of fins under constant heat flux conditions are presented. Experiments are performed at various Reynolds numbers in the range of 1000–9000 and heat fluxes in the range of 0.91–3.64 kW/m2 . The predicted results are validated by comparing with measured data. The predicted results are in reasonable agreement with the experiments. It is found that with increase in Reynolds number, the Nusselt number and thermal performance increases, for a fin having aerofoil profile as compared with a fin with square and circular profile. These are because of delayed separation of air and increase in contact time for a fin having aerofoil profile as compared with a fin with square and circular profile.

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Experimental investigation of heat transfer from different pin fin in a rectangular channel

Cited by 26 publications

References 22 publications

Experimental and numerical analysis of the multilayer distributed Joule‐Thomson cooler with pillars

Experimental and numerical analysis of the multilayer distributed Joule‐Thomson cooler with pillars

Thermo-hydraulic performance of modified plate fin and pin fin heat sinks

Enhancement of Heat Transfer Characteristics using Aerofoil Fin over Square and Circular Fins

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