Testing of the Model of the Heat Exchanger Supercharger With a Flat Active Par

This paper designs a pulsation-generating structure to provide pulsating flow for experiments. The relationship between frequency, flow and pulsating flow enhancement heat transfer is discussed separately. The characteristics of pulsating flow enhanced heat transfer are analyzed, and the theoretical research and engineering application of pulsating heat transfer are proposed. The scheme of the laboratory installation is developed, which is an independent circuit from the heat source with a pulse circulation of the coolant. The unit allows testing the heat exchanger-supercharger at different performance at the frequency of fluctuations of the coolant from 0.5 to 2 Hz. As a result of thermal tests, graphs of temperature changes over time in the heated and closed circuit at flow interruption frequencies from 0.5 to 1 Hz are obtained. It is found that with increasing frequency of flow fluctuations, the heating time of the coolant in a closed loop decreases by almost 1.85 times.

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Prediction of heat transfer correlations in a low-loaded plate- fin-and-tube heat exchanger based on flow-thermal tests

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2018.11.060 ◽

2019 ◽

Vol 148 ◽

pp. 641-649 ◽

Cited By ~ 10

Author(s):

Dawid Taler ◽

Jan Taler

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Thermal Tests ◽

Tube Heat Exchanger ◽

Loaded Plate ◽

Heat Transfer Correlations

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Resonant Pulsating Flow and Convective Heat Transfer

Journal of Heat Transfer ◽

10.1115/1.3689145 ◽

1965 ◽

Vol 87 (4) ◽

pp. 507-512 ◽

Cited By ~ 13

Author(s):

T. W. Jackson ◽

K. R. Purdy

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Convective Heat ◽

Local Heat Transfer ◽

Reynolds Numbers ◽

Local Heat ◽

Pulsating Flow ◽

Transfer Coefficients ◽

Heat Transfer Coefficients ◽

Superposition Technique

The results of experiments on the behavior of a simple convective heat exchanger which was subjected to a resonant pulsating flow are described. A 3.86-in. ID horizontal, isothermal tube, 10 ft long, through which air was blown at Reynolds numbers from 2000 to 200,000, was used as the heat exchanger. Both the thermal and the hydrodynamic boundary layers started at the same position in the apparatus. Local heat transfer coefficients were obtained experimentally and compared to equations derived, using a superposition technique, for both the laminar and turbulent regimes.

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Simulation Study for Heat Transfer Performance of Spiral Flow Double-Pipe Heat Exchanger

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.3024 ◽

2012 ◽

Vol 550-553 ◽

pp. 3024-3028

Author(s):

Yi Ning Wang ◽

Qun Hui Lu ◽

Yang Yan Zheng ◽

Biao Yuan

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Shear Force ◽

Heat Transfer Performance ◽

Engineering Application ◽

Transfer Performance ◽

Spiral Flow ◽

Surface Shear ◽

Double Pipe ◽

Pipe Heat

In this article, simulation analysis has been performed for the flow and heat transfer performance of spiral flow double-pipe heat exchanger using finite volume method, respectively for the relationship between Nu and the average shear force on inner pipe outer wall at different turbulent flow Re with different radial offset of inlet and outlet pipes and different spacing of inlet and outlet pipes. The results show that, as compared with an ordinary double-pipe heat exchanger, in a spiral flow double-pipe heat exchanger, both inner pipe convective heat exchange coefficient and inner pipe wall surface shear force are lower, with the magnitude of reduction related to a number of factors such as radial offset of inlet and outlet pipes and Re. The study in this article has provided theoretical basis for further engineering application of spiral flow double-pipe heat exchangers.

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Organization of Pulsating Air Flow Through a Heat Exchanger

Bulletin of Science and Practice ◽

10.33619/2414-2948/62/26 ◽

2021 ◽

Vol 7 (1) ◽

pp. 262-269

Author(s):

J. Li ◽

J. Shan ◽

Z. Guo ◽

A. Levtsev

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Air Flow ◽

Pulsating Flow ◽

Transfer Efficiency ◽

Enhancement Of Heat Transfer ◽

Transfer Rates ◽

Electric Actuator ◽

Heat Transfer Efficiency ◽

Flow Through

In recent years, the enhancement of heat transfer by pulsating flow has become a research hotspot. A great deal of work has been done in the past, with remarkable results, to achieve better heat transfer rates. How to improve the efficiency of heat exchanger is always a research topic. In this paper, pulsating air flow is formed by standard ventilation grille and electric actuator, and the pulsating air flow is guided through two-stage heat exchanger to study the influence of pulsating air flow on heat transfer efficiency. The experimental results show that the heat transfer efficiency can be improved by pulsating flow and the heat recovery efficiency can be reduced by increasing the flow rate of the heating medium.

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