Experimental study of heat transfer in oscillating flow

Bouvier, Pascale; Stouffs, Pascal; Bardon, J. P.

doi:10.1016/j.ijheatmasstransfer.2005.01.037

Cited by 48 publications

(19 citation statements)

References 14 publications

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“…Heat transmission by oscillating the liquid metals is a topic of current interest owing to its tremendous applications in transporting thermal energy from Sterling and Brayton engines [8,9] and cooling of space nuclear reactors [10], high power electrical and electronic equipments. Further details on the designs of heat removal devices using liquid metals for fission surface power for Mars Moon and surface missions are well explained in [11].…”

Section: Introductionmentioning

confidence: 99%

Study of Conjugate Heat Transfer in Electromagnetic Liquid Metal Dream Pipe

Puvaneswari

Karthikeyan

2017

Archive of Mechanical Engineering

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The combined effect of conjugation, external magnetic field and oscillation on the enhancement of heat transfer in the laminar flow of liquid metals between parallel plate channels is analyzed. In order to make our results useful to the design engineers, we have considered here only the wall materials that are widely employed in liquid metal heat exchangers. Indeed, all the results obtained through this mathematical investigation are in excellent agreement with the available experimental results. The effective thermal diffusivity κ e is increased by 3 · 10 6 times due to oscillation and that the heat flux as high as 1.5 · 10 10 (W/m 2 ) can be achieved. Based on our investigation, we have recommended the best choice of liquid metal heat carrier, wall material and its optimum thickness along with the optimum value of the frequency to maximize the heat transfer rate. At the optimum frequency, by choosing a wall of high thermal conductivity and optimum thickness, an increase of 19.98% in κ e can be achieved. Our results are directly relevant to the design of a heat transfer device known as electromagnetic dream pipe which is a very recent development.

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Section: Introductionmentioning

confidence: 99%

Study of Conjugate Heat Transfer in Electromagnetic Liquid Metal Dream Pipe

Puvaneswari

Karthikeyan

2017

Archive of Mechanical Engineering

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“…Nevertheless, energy-conversion devices involve for the most part unsteady heat transfer in the presence of compressible gaseous flows. In the treatment of most gaseous flows the assumption of a constant wall temperature is adequate [3] and the heat transfer process is not conjugate. These problems are simplified to obtaining information on the heat transfer coefficient (HTC) and using this to quantify the convective heat transfer in the fluid.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer augmentation in unsteady conjugate thermal systems – Part II: Applications

Mathie

Nakamura

Markides

2013

International Journal of Heat and Mass Transfer

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Many energy conversion and other thermal-fluid systems exhibit unsteady convective heat exchange. In such systems, generic spatiotemporal variations in the flow give rise to variations in the heat flux for a given fluid-solid temperature difference, which can be interpreted as spatiotemporal fluctuations of the instantaneous heat transfer coefficient. These variations can lead to unsteady conjugate heat transfer, in which the exchanged heat flux arises from an interaction between the bulk fluid temperature and the temperature in the solid. Further, the nonlinear coupling between the fluctuating temperature differences and the heat transfer coefficient can lead to an effect we refer to as augmentation, which quantitatively describes the ability of a particular arrangement to have a different time-mean heat flux from the product between the mean heat transfer coefficient and the mean temperature difference across the fluid. It is important to be able to understand and to model in a simple framework the effects of the material properties, the geometry and the character of the heat transfer coefficient on the thermal response of the fluid-solid system, and consequently to predict the overall heat transfer performance of these systems. This paper, which follows on from its predecessor (Mathie and Markides, 2012a), is concerned with the phenomenon of augmentation in simple, one-dimensional, unsteady and conjugate fluid-solid systems. A simple semi-analytical one-dimensional model of heat transfer with a time-varying heat transfer coefficient, which was presented in Mathie and Markides (2012a), is applied herein to two different paradigm problems. Such a model can be an important tool in the design of improved heat exchangers and thermal insulation, through for example, the novel selection of materials to exploit these augmentation effects. The first flow considered is a thin, wavy fluid film flowing over a heated plate. This film flow exhibits a periodic fluctuation in the heat transfer coefficient, that is linked to the wavy interfacial deformations of free surface of the liquid film. The second flow considered concerns the heat transfer behind a backwards-facing step, which exhibits broadband fluctuations in the heat transfer coefficient due to the flow separation and turbulence behind * Corresponding author.

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“…Meanwhile, the heat transfer is hard to evaluate because the empirical correlation for steady flow cannot be directly applied. A well accepted heat transfer correlation for oscillating flow is still absent, although much investigation has been carried out in this area [13,18,23,24]. Thus, in this work, we used experiments to determine the influence of factors such as the hydraulic diameter, length, contact thermal resistance, and porosity, on the cooling performance of a pulse tube refrigerator.…”

Section: Introductionmentioning

confidence: 99%

“…Sci. 2017, 7, 229 3 of 11 area [13,18,23,24]. Thus, in this work, we used experiments to determine the influence of factors such as the hydraulic diameter, length, contact thermal resistance, and porosity, on the cooling performance of a pulse tube refrigerator.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Water-Cooled Heat Exchanger on the Performance of a Pulse Tube Refrigerator

Wang

et al. 2017

Applied Sciences

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Abstract:The water-cooled heat exchanger is one of the key components in a pulse tube refrigerator. Its heat exchange effectiveness directly influences the cooling performance of the refrigerator. However, effective heat exchange does not always result in a good performance, because excessively reinforced heat exchange can lead to additional flow loss. In this paper, seven different water-cooled heat exchangers were designed to explore the best configuration for a large-capacity pulse tube refrigerator. Results indicated that the heat exchanger invented by Hu always offered a better performance than that of finned and traditional shell-tube types. For a refrigerator with a working frequency of 50 Hz, the best hydraulic diameter is less than 1 mm.

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Experimental study of heat transfer in oscillating flow

Cited by 48 publications

References 14 publications

Study of Conjugate Heat Transfer in Electromagnetic Liquid Metal Dream Pipe

Study of Conjugate Heat Transfer in Electromagnetic Liquid Metal Dream Pipe

Heat transfer augmentation in unsteady conjugate thermal systems – Part II: Applications

Influence of the Water-Cooled Heat Exchanger on the Performance of a Pulse Tube Refrigerator

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