Study on Heat Transfer in Self-Excited Oscillation with Backflow Vortex Disturbance Effect

Hu, Gaoquan; Wang, Zhaohui; Gao, Qian; Yang, Qianwen; Peng, Feng

doi:10.2514/1.t6172

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…The aim at using the pw-xt insert was to produce streamwise-vortex flows, which can reduce the thickness of thermal boundary laver and increase fluid mixing of the flow. Hu et al [13] studied the influence of self-excited oscillation backflow vortex disturbance effect on heat transfer. The results showed that the backflow vortex increased the turbulence intensity of the fluid, and the heat transfer efficiency was increased by 23%.…”

Section: Introductionmentioning

confidence: 99%

Study on the disturbance effect of pulsating flow and heat transfer in self-excited oscillation shear layer

Wang

Fan

et al. 2022

THERM SCI

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The fluid movement motion has an important influence on the evolution of the pulsating flow in the hot runner. Using the Large Eddy Simulation numerical method, the instantaneous velocity, wall shear stress, boundary layer thickness and Nu number of hot runner section under different structural parameters at an inlet pressure of 5000 Pa were studied. The research results showed that the backflow vortex can be formed in the hot runner, and the fluid at the axis center of hot runner can form a pulsating flow under the squeezing action of the backflow vortex. The pulsating flow had a strong disturbance effect on the fluid around the axis center and accelerated the heat exchange between the fluid around the axis center and the wall. The disturbance effect of pulsating flow gradually strengthened with the flow of the main flow to the downstream. When d2/d1 was 1-1.8, the wall shear stress first increased and then decreased, and the wall heat transfer efficiency first increased and then decreased. The maximum wall shear stress was 36.4Pa. When L/D was 0.45-0.65, the boundary layer thickness first decreased and then increased, and the heat transfer efficiency first increased and then decreased. The minimum boundary layer thickness was 0.392mm and the maximum Nu number was 138. When d2/d1=1.4 and L/D=0.55, the maximum comprehensive evaluation factor reached 1.241, and the heat transfer efficiency was increased by 24.1%.

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Section: Introductionmentioning

confidence: 99%

Study on the disturbance effect of pulsating flow and heat transfer in self-excited oscillation shear layer

Wang

Fan

et al. 2022

THERM SCI

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“…Wang et al [22] analyzed the feasibility of enhancing heat transfer in the selfexcited-oscillation shell-and-tube heat exchanger, and the results proved that the application of the self-excited-oscillation cavity structure in the shell-and-tube heat exchanger can not only effectively prevent fouling, but also facilitate the optimization design of scaling of existing shell and tube heat exchanger. Hu et al [23] studied the effect of self-excited oscillation backflow vortex on heat transfer through large-eddy simulations (LESs). They found that there is a pulsating flow in the self-excited oscillation outlet flow channel, and the backflow vortex near the wall can effectively improve the heat transfer efficiency.…”

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confidence: 99%

Self-Excited Counterflow Disturbance and Heat Transfer Characteristics of Al2O3–Water Nanofluids

Yuan

Wang

et al. 2022

Journal of Thermophysics and Heat Transfer

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A numerical study of the heat transfer and flow resistance performance of Al 2 O 3 -water nanofluids in selfoscillating hot runners with different chamber lengths was performed. The control volume method based on the Semi-Implicit Method for Pressure Linked Equations (SIMPLE) algorithm was used to numerically solve the governing equations of the two-dimensional computational domain. The inlet flow rate was determined according to the Reynolds number (10;000 < Re < 50;000), and the uniform temperature was applied to the wall of the hot runner. The effects of chamber length and volume fraction on the heat transfer performance of nanofluids vortex pulsation were described by temperature, thermal boundary-layer thickness, pulsation frequency, Nusselt number, pressure drop, and heat transfer performance evaluation index. The simulation outcomes indicated that the counterflow vortex can reduce the thermal boundary-layer thickness and increase the mixing degree between the central mainstream region and the wall. It was also observed that the heat transfer performance increases with the increase of the chamber length. When L∕d 1 5.6, the heat transfer performance is the highest, and the main frequency (f 398.01 HZ) at the center of the chamber corresponds to the pressure pulsation amplitude of 35,982.6 Pa.

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Multi-objective optimization of self-excited oscillation heat exchange tube based on multiple concepts

Cheng

Wang

Sun

et al. 2021

Applied Thermal Engineering

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Study on Heat Transfer in Self-Excited Oscillation with Backflow Vortex Disturbance Effect

Cited by 4 publications

References 26 publications

Study on the disturbance effect of pulsating flow and heat transfer in self-excited oscillation shear layer

Study on the disturbance effect of pulsating flow and heat transfer in self-excited oscillation shear layer

Self-Excited Counterflow Disturbance and Heat Transfer Characteristics of Al2O3–Water Nanofluids

Multi-objective optimization of self-excited oscillation heat exchange tube based on multiple concepts

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