Local experimental heat transfer of single-phase pulsating laminar flow in a square mini-channel

Mehta, Balkrishna; Khandekar, Sameer

doi:10.1016/j.ijthermalsci.2015.01.008

Cited by 50 publications

(22 citation statements)

References 31 publications

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“…The brief review of relevant literature is presented in the authors' earlier works [1][2][3][4] which concerned steady-state studies on flow boiling heat transfer in minichannels. This paper focused on flow boiling heat transfer under unsteady state conditions in channels of similar dimensions like in [5,6]. In literature the results of experiments concerning time-dependent flow parameters during fluid flow in small gaps are rare.…”

Section: Introductionmentioning

confidence: 99%

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The heat transfer and instabilities results during the onset of flow boiling in minichannels

Maciejewska

Piasecka

Piasecki³

2019

E3S Web Conf.

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The paper discusses the results of flow boiling heat transfer in minichannels obtained on the basis of time-dependent experiments. The main interest of the work was to investigate the occurrence of the accompanying instabilities during the boiling incipience. The essential part of the experimental standwas a test section with two minichannels, each of 1.7 mm depth. The heated element for FC–72flowing along the minichannels was a thin foil. In the tested minichannel, the temperature of the outer surface of the foil was measured due to thermoelements. The onset of flow boiling in minichannels was induced by increasing the heat flux supplied to the heater. The main aims of the investigation were to determine the heat transfer coefficient by means of the FEM with time—dependent Trefftz–type basis functions based on the Hermite interpolation and to recognize dynamic instabilities during boiling incipience. The results were illustrated as: the heat transfer coefficient, the mass flow rate and the inletpressure versustime and as boiling curves.

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Section: Introductionmentioning

confidence: 99%

“…In literature the results of experiments concerning time-dependent flow parameters during fluid flow in small gaps are rare. Several examples of works dealing with this topic are [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The heat transfer and instabilities results during the onset of flow boiling in minichannels

Maciejewska

Piasecka

Piasecki³

2019

E3S Web Conf.

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“…Mehta [16] studied experimental research; it is found that the laminar pulsating flow has no significant effect on the overall heat transfer characteristics in the measured frequency range compared with the steady-state flow with the time-averaged flow Reynolds number. This effect is limited, mainly refers to the development length of the channel, so heat transfer enhancement due to periodic pulsating flow is questionable, and at best, rather limited.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Heat Transfer of Pulsating Flow Enhanced the Plate Heat Exchanger

Qian

Kudashev

Plotnikov

2019

BSP

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We conducted two sets of experiments, one is under steady-state conditions and the other under pulsating conditions. We focused on measuring the heat transfer characteristics of plate heat exchangers under different pulsation conditions. In the experiment, we control the mass flow of the hot fluid to circulate at a rate of 0.722 kg/s. The mass flow rate of the cold fluid is 0.05-0.18 kg/s, and the pulsation frequency is 0.45-2.23 Hz. We measured different mass flows at different pulsation frequency. The data analysis shows that when the pulsation frequency is 1.78 Hz, the heat transfer coefficient reaches a maximum of 4415.73 w/(m 2 •k), and the corresponding cold fluid mass flow rate is 0.155 kg/s, and compared with the heat transfer characteristics of the plate heat exchanger under steady flow, it is found that the average increase in the heat transfer coefficient during the transition to the pulsating mode was 20%. Аннотация. Статья посвящена исследованию теплопередачи при пульсирующем режиме течения теплоносителя. В данной статье проведено две серии экспериментов в пульсирующем и стационарном режимах. Эксперименты проводились при различных режимах пульсаций. Расход греющей жидкости поддерживался постоянным 0,722 кг/с. Изменялись массовый расход нагреваемого теплоносителя от 0,05-0,18 кг/с, и частота пульсаций-0,45-2,25 Гц. Анализ полученных данных показывает что при частоте пульсаций 1,78 Гц, коэффициент теплопередачи достигает максимума 4415,73 Вт/(м 2°С) соответствующий массовый расход жидкости составлял 0,155 кг/с. При этом среднее увеличение коэффициента теплопередачи при переходе к пульсирующему режиму составило 20%

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“…Researches about heat transfer in flat channels and pipes under pulsating flow condition points out that the effect of pulsating flow is limited in these geometries [1][2][3][4][5]. Depending on flow parameters, heat transfer can be enhanced or reduced.…”

Section: Introductionmentioning

confidence: 99%

Pulsating Flow and Heat Transfer in Wavy Channel with Zero Degree Phase Shift

Zontul¹,

Kurtulmuş²,

Şahi̇n³

2017

European Mechanical Science

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In this study, heat transfer enhancement of laminar pulsating flow in wavy channel is investigated numerically. The wavy channel has constant wall temperature and its geometric parameters are fixed. Finite volume method based on SIMPLE technique is used to solve governing equations. Simulations performed for Reynolds numbers in the range of 200≤Re≤800. The effects of pulsation frequency is investigated for Strouhal numbers, (St) of 0.05, 0.15 and 0.25. The differences between flow structures of pulsating and steady flow are discussed. Results indicate that the pulsating flow significantly enhances heat transfer.

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Local experimental heat transfer of single-phase pulsating laminar flow in a square mini-channel

Cited by 50 publications

References 31 publications

The heat transfer and instabilities results during the onset of flow boiling in minichannels

The heat transfer and instabilities results during the onset of flow boiling in minichannels

Experimental Study on Heat Transfer of Pulsating Flow Enhanced the Plate Heat Exchanger

Pulsating Flow and Heat Transfer in Wavy Channel with Zero Degree Phase Shift

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