An experimental investigation on the critical heat flux enhancement by mechanical vibration in vertical round tube

Lee, Yong-Ho; Kim, Dae Hun; Chang, Soon Heung

doi:10.1016/j.nucengdes.2003.11.015

Cited by 36 publications

(8 citation statements)

References 13 publications

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“…The results showed that the behavior of cavitation bubbles strongly affected the degree of heat transfer enhancement in the natural convection and subcooled boiling regimes. Katinas et al [30,31], Lee et al [32], and Klaczak [33] discussed the heat transfer enhancement characteristics of water in 6.8-30 mm diameter circular tubes at frequencies and vibration amplitudes in the 0-120 Hz and 0-0.9 mm ranges, respectively. Their experimental results showed that the optimum enhancement was as much as 30% within the range of experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Vibration on Forced Convection Heat Transfer for SiO₂–Water Nanofluids

Zhang

Bai

et al. 2014

Heat Transfer Engineering

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In the process of heat transfer, the fluid type and external parameters have a significant impact on heat transfer performance. For this reason, the physical properties, pressure differences, and heat transfer rates of SiO 2 -water nanofluids have been experimentally investigated in a straight circular pipe. Experimental results revealed a great difference in physical properties between SiO 2 -water nanofluids and purified water. The friction factor of low-volume-concentration nanofluids was slightly increased for laminar flow and tended to be almost independent of the Reynolds number for turbulent flow. The heat transfer coefficient can be enhanced either by adding nanoparticles to purified water or by imposing a transverse vibration on the heat transfer surface. Using these two methods at the same time (compound heat transfer enhancement), heat transfer performance is much better than that with either method alone. The largest increase of about 182% was observed under conditions of compound heat transfer enhancement.

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Section: Introductionmentioning

confidence: 99%

Effect of Vibration on Forced Convection Heat Transfer for SiO₂–Water Nanofluids

Zhang

Bai

et al. 2014

Heat Transfer Engineering

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“…Lee et.al. [4] performed an practical study to improve the critical heat flux CHF by mechanical vibration of a vertical round tube that was heated under a constant heat flux. The tube was subjected to forced vibration at 0 to 70 Hz and a vibration amplitude of 0 to 0.001 mm.…”

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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“…The void fraction profiles also changed from "wall peak" to "core peak" or "transition." Lee et al [15] performed CHF experiments with vibrating test section. The results showed that the CHF was enhanced by increasing vibration amplitude and frequency.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Interfacial Area Transport of Two-Phase Flow under Vibration Conditions

Xiao

Zhu

Chen

et al. 2017

Science and Technology of Nuclear Installations

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An experimental study on air-water two-phase flow under vibration condition has been conducted using double-sensor conductivity probe. The test section is an annular geometry with hydraulic diameter of 19.1 mm. The vibration frequency ranges from 0.47 Hz to 2.47 Hz. Local measurements of void fraction, interfacial area concentration (IAC), and Sauter mean diameter have been performed along one radius in the vibration direction. The result shows that local parameters fluctuate continuously around the base values in the vibration cycle. Additional bubble force due to inertia is used to explain lateral bubble motions. The fluctuation amplitudes of local void fraction and IAC increase significantly with vibration frequency. The radial distribution of local parameters at the maximum vibration displacement is specifically analyzed. In the void fraction and IAC profiles, the peak near the inner wall is weakened or even disappearing and a strong peak skewed to outer wall is gradually observed with the increase of vibration frequency. The nondimensional peak void fraction can reach a maximum of 49% and the mean relative variation of local void fraction can increase to more than 29% as the vibration frequency increases to 2.47 Hz. But the increase of vibration frequency does not bring significant change to bubble diameter.

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An experimental investigation on the critical heat flux enhancement by mechanical vibration in vertical round tube

Cited by 36 publications

References 13 publications

Effect of Vibration on Forced Convection Heat Transfer for SiO₂–Water Nanofluids

Effect of Vibration on Forced Convection Heat Transfer for SiO₂–Water Nanofluids

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

Experimental Study on Interfacial Area Transport of Two-Phase Flow under Vibration Conditions

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An experimental investigation on the critical heat flux enhancement by mechanical vibration in vertical round tube

Cited by 36 publications

References 13 publications

Effect of Vibration on Forced Convection Heat Transfer for SiO2–Water Nanofluids

Effect of Vibration on Forced Convection Heat Transfer for SiO2–Water Nanofluids

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

Experimental Study on Interfacial Area Transport of Two-Phase Flow under Vibration Conditions

Contact Info

Product

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Effect of Vibration on Forced Convection Heat Transfer for SiO₂–Water Nanofluids

Effect of Vibration on Forced Convection Heat Transfer for SiO₂–Water Nanofluids