Experimental study on the effects of mechanical vibration on the heat transfer characteristics of tubular laminar flow

Liu, Wenjie; Yang, Zhuqiang; Zhang, Bo; Lv, Peng

doi:10.1016/j.ijheatmasstransfer.2017.07.025

Cited by 68 publications

(16 citation statements)

References 20 publications

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“…The simulated vibrations, characterized by frequency not exceeding f=75Hz and amplitude below δ=1mm do not introduce sufficient kinetic energy to create the boundary-layer vertices, resulting in significant turbulization of the fluid. Nevertheless, further investigation on effect of induction of vibrations of frequency close to the resonant frequency of the system, inspired by the promising results of the analysis discussed in [22], states subject of the future research. Furthermore, due to the introductory nature of the presented computational research, discussed results are aimed to be verified during future experimental investigation.…”

Section: Discussionmentioning

confidence: 98%

“…However, the investigations has not considered utilization of vibrating elements to enhance the heat transfer due to turbulization of the flow of external circulating medium. Although considerably positive effect of vibrations on heat dissipation has been investigated and discussed [22,23], its applicability within the solar thermal collectors has not be investigated yet.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of influence of vibration on intensification of heat transfer within the absorber of the vacuum solar collector

et al. 2019

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Due to escalating role of mitigation of climate change in power and energy sector, power units based on renewable energy sources (RES) became vital part of global power and heat market, including distributed heat generation as well. Significant number of such installations belong to individual users, commonly using solar collectors to prepare domestic hot water directly at their sites. However, the vitally variable solar irradiance makes the solar energy difficult in efficient harvesting considering long time period. Thus, maximization of power gain from single solar absorber, when the solar radiation flux is temporarily high, might lead to further rise in overall, year-averaged efficiency of such units. The paper concerns modelling of intensification of heat transfer, taking place within the absorber of a vacuum solar collector, due to insertion of vibrating element inside the thermal oil canal, compared to static turbulization method. Different geometries of vibrating elements and amplitudes of oscillatory motion, as well as heat carriers, are investigated using commercially available CFD software. Results indicate rise in solar power acquired within the absorber using vibrating elements, with essential difference between circulating media, and suggest vital benefits from utilization of static turbulizing devices.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Modeling of influence of vibration on intensification of heat transfer within the absorber of the vacuum solar collector

et al. 2019

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“…LITERATURE SURVEY Cheng et al [1] in this work it is found that the flow induced vibration at the low flow velocity can significantly increase the convective heat transfer coefficient of the nonlinear heat transfer device. Compared with the average tube outside convective heat transfer coefficient of the fixed tube bundle, the average tube outside convective heat transfer coefficient of this device is improved by more than two times, while the fouling resistance is reduced by two-third.…”

Section: IImentioning

confidence: 99%

“…The main advantages of spiral heat exchanger it consume less area compared to other geometry for same temperature difference. Many researcher has done work on helical and spiral geometry [1,5], some of the researcher explain triple flow heat exchanger [3] and some conducted their experiment under different frequency and vibration [10, 11 and 12] ©IJRASET: All Rights are Reserved…”

Section: Introductionmentioning

confidence: 99%

Advancement in Triple Flow Heat Exchanger using Vibration

Kamble¹

2019

IJRASET

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An advancement in triple flow heat exchanger using vibration has been carried out with different flow arrangements that is hot fluid at middle of pipe where as cold fluid passed remaining two pipes with counter and cross flow types. So that surface area of heat exchanger will be increases and more heat transfer takes place. For creating theturbulence in fluid flow inside the arrangement we can use vibrator at lower side of the concentric pipe so that transfer of heat from one pipe to other are more with the turbulent flow and increase the (LMTD) logarithmic mean temperature difference. The main aim of arrangement is to increase the heat transfer using three pipes and vibrator arrangement.

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“…Liu et.al. [10] practically studied the influence of mechanical vibrations on the characteristics of heat transfer of the laminar flow in a copper circular tube exposed to vibration by frequencies ranging from 158 Hz to 3000 Hz and accelerations of vibration 1, 3 and 5 g. It was found that the influence of frequency on improved heat transfer was larger than the effect of intensity of vibration. The maximum increase in heat transfer 14.94% is achieved when the Reynolds number is 512 and the vibration frequency is 400 Hz.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of The Influence of Mechanical Forced Vibrations and Heat Flux on Coefficient of Heat Transfer

Bash

Alkumait

Yaseen

2018

SJUOZ

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The aim of this paper to verify the influence of vertical forced vibration on the coefficient of heat transfer of the laminar internal flow in a spiral fluted tube. With adopted the water as a working fluid, and flowing Reynolds numbers at the entrance between 228 and 1923, the tube heated under constant heat flux levels ranging from 618-3775 W/m2. The frequencies of vibration ranging from 13 to 30 Hz, and the amplitudes of vibration from 0.001 to 0.002 mm. The results appeared that the coefficient of heat transfer significantly affected by mechanical forced vibration in a flowing of the heated tube. When the vibration amplitude increases, the Nusselt number Significantly increases, with the maximum increases of 8.4% at the amplitude of vibration 0.0022 mm and the frequency 13 Hz. Generally, the coefficient of heat transfer increases with increasing Reynolds number and heat flux. At last, by using the parameters of vibration amplitude, frequency, heat flux and Reynolds number, a new correlation has been derived depends on experimental data.

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Experimental study on the effects of mechanical vibration on the heat transfer characteristics of tubular laminar flow

Cited by 68 publications

References 20 publications

Modeling of influence of vibration on intensification of heat transfer within the absorber of the vacuum solar collector

Modeling of influence of vibration on intensification of heat transfer within the absorber of the vacuum solar collector

Advancement in Triple Flow Heat Exchanger using Vibration

Experimental Investigation of The Influence of Mechanical Forced Vibrations and Heat Flux on Coefficient of Heat Transfer

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