Investigation on emergency core coolant bypass with local measurement of liquid film thickness using electrical conductance sensor fabricated on flexible printed circuit board

Choi, Chi-Jin; Cho, Hyoung Kyu

doi:10.1016/j.ijheatmasstransfer.2019.05.019

Cited by 13 publications

(2 citation statements)

References 32 publications

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“…Effect of the Flow Rate on Liquid Film Thickness. The conductance measurement method was used to determine the thickness of the liquid film [18][19][20][21]. The effect of flow rate on liquid film thickness at different flow rates was shown in Figure 6.…”

Section: 3mentioning

confidence: 99%

Effect of Hydrophilicity/Hydrophobicity of the Injector Wall on Atomization Performance

Zhang

Duan

et al. 2022

International Journal of Aerospace Engineering

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Hydrophilicity/hydrophobicity is a common physical property of the material. Water droplets roll on lotus leaf, and a lot of dust and dirt on the surface of the lotus leaf will be taken away, playing a certain cleaning role. The hydrophobic surface has drag reduction effect that would produce slip on the hydrophobic wall. There are some studies on hydrophilicity/hydrophobicity in channels, most of which focus on the effect of surface drag reduction and heat transfer on microchannels. However, few people pay attention to the effect of the hydrophilicity/hydrophobicity of the injector inner wall on the atomization performance. In this paper, three groups of the open-end swirl injector with different tangential channels were designed to study the effect of hydrophilicity/hydrophobicity on atomization performance. The hydrophobic coating was prepared and used on the inner wall of the injector, and the atomization experimental system was built. In the experiment, the liquid film thickness was measured using the conductance method. Details of the liquid film breakup and spray development were recorded with a high-speed camera. The average droplet diameter was measured by the Malvern particle size analyzer. The atomization performance of injectors with different tangential channels on the hydrophilicity/hydrophobicity was compared, and the effect of the velocity profile on the jet stability is discussed.

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Section: 3mentioning

confidence: 99%

Effect of Hydrophilicity/Hydrophobicity of the Injector Wall on Atomization Performance

Zhang

Duan

et al. 2022

International Journal of Aerospace Engineering

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“…Researchers have used flexible printed circuit board (FPCB) to substitute rigid PCB (RPCB) in several applications attributable to its lightweight, reduced thickness and better flexibility characteristics (Choi and Cho, 2019;Lee and Cha, 2017;Min et al, 2020;Sheng et al, 2021). Heat-induced stress is a constant problem in modern electrical gadgets.…”

Section: Introductionmentioning

confidence: 99%

Optimization of flexible printed circuit board’s cooling with air flow and thermal effects using response surface methodology

Lim

Abdullah

Aziz

et al. 2021

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Purpose This study aims to investigate the interaction of independent variables [Reynolds number (Re), thermal power and the number of ball grid array (BGA) packages] and the relation of the variables with the responses [Nusselt number ((Nu) ¯ ), deflection/FPCB’s length (d/L) and von Mises stress]. The airflow and thermal effects were considered for optimizing the Re of various numbers of BGA packages with thermal power attached on flexible printed circuit board (FPCB) for optimum cooling performance with least deflection and stress by using the response surface method (RSM). Design/methodology/approach Flow and thermal effects on FPCB with heat source generated in the BGA packages have been examined in the simulation. The interactive relationship between factors (i.e. Re, thermal power and number of BGA packages) and responses (i.e. deflection over FPCB length ratio, stress and average Nusselt number) were analysed using analysis of variance. RSM was used to optimize the Re for the different number of BGA packages attached to the FPCB. Findings It is important to understand the behaviour of FPCB when exposed to both flow and thermal effects simultaneously under the operating conditions. Maximum d/L and von Misses stress were significantly affected by all parametric factors whilst (Nu)¯ is significantly affected by Re and thermal power. Optimized Re for 1–3 BGA packages with maximum thermal power applied has been identified as 21,364, 23,858 and 29,367, respectively. Practical implications This analysis offers a better interpretation of the parameter control in FPCB with optimized Re for the use of force convection electronic cooling. Optimal Re could be used as a reference in the thermal management aspect in designing the BGA package. Originality/value This research presents the parameters’ effects on the reliability and heat transfer in FPCB design. It also presents a method to optimize Re for the different number of BGA packages attached to increase the reliability in FPCB’s design.

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The effect of gas streams on the hydrodynamics, heat and mass transfer in falling film evaporation, absorption, cooling and dehumidification: A comprehensive review

Zhao

Liang

et al. 2022

Building and Environment

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Investigation on emergency core coolant bypass with local measurement of liquid film thickness using electrical conductance sensor fabricated on flexible printed circuit board

Cited by 13 publications

References 32 publications

Effect of Hydrophilicity/Hydrophobicity of the Injector Wall on Atomization Performance

Effect of Hydrophilicity/Hydrophobicity of the Injector Wall on Atomization Performance

Optimization of flexible printed circuit board’s cooling with air flow and thermal effects using response surface methodology

The effect of gas streams on the hydrodynamics, heat and mass transfer in falling film evaporation, absorption, cooling and dehumidification: A comprehensive review

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