Application of Boiling Heat Transfer to High-Heat-Flux Cooling Technology in Power Electronics

Suzuki, Koichi; Yuki, Kazuhisa; Mochizuki, Masahito

doi:10.5104/jiepeng.4.127

Cited by 21 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Suzuki et al achieved MEB for aqueous solutions of ethanol, propanol, and butanol but failed for pure ethanol at different liquid subcooling. They also investigated the effect of heater size on MEB for subcooled flow boiling of water . Both the maximum heat flux of MEB and CHF was reduced with an increase in the heater size due to higher downstream liquid temperature.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of transition process from nucleate boiling to microbubble emission boiling under transient heating modes

Tang

Sun

et al. 2019

AIChE Journal

View full text Add to dashboard Cite

This study investigated the transition from nucleate boiling to microbubble emission boiling (MEB) on a small heating surface under transient heating modes. During the short unstable boiling process after critical heat flux with a rapid increase in wall temperature, capillary waves were observed over the vapor film at subcooling of 30–40 K. The visualization results in this process demonstrated that the partial collapse of vapor film induced strong jet toward the heating surface and therefore avoided complete dryout thereon. This mechanism certainly plays an important role in the transition to stable MEB. Further comparison between the wall temperature and boiling states indicates that the wall temperature at onset point of stable MEB is determined by the predominance of MEB mode over film boiling in the transition process. Effects of liquid subcooling and surface oxidation on the transition process were also investigated at the same time.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental investigation of transition process from nucleate boiling to microbubble emission boiling under transient heating modes

Tang

Sun

et al. 2019

AIChE Journal

View full text Add to dashboard Cite

show abstract

“…Transactions of The Japan Institute of Electronics Packaging Vol. 11,2018 boiling heat transfer was used for cooling. The transition from the nucleate boiling regime to the film boiling regime occurs suddenly, and it is very difficult to control.…”

Section: E18-010-2mentioning

confidence: 99%

“…It has been reported that MEB in the subcooled flow boiling of water can remove a very high heat flux of 1,000 W/cm 2 . [11] Previously, the onset of MEB was examined by varying the degree of subcooling, working fluid, system pressure and ultrasonic field. [12][13][14] How-ever, the volume of boiling pool was comparatively large (> 1 L) in the previous studies.…”

Section: E18-010-2mentioning

confidence: 99%

See 1 more Smart Citation

Advanced Boiling Cooling Technology Using a Compact Vessel with a Low Water Level

Unno

Yuki

Kibushi

et al. 2018

Transactions of The Japan Institute of Electronics Packaging

Self Cite

View full text Add to dashboard Cite

There is a strong demand for compact cooling devices that is used for power electronics such as inverters of electric vehicles. Aiming for improving the performance of cooling devices with downsizing it, boiling heat transfer attracts a lot of attention because of its high heat transfer coefficient. However, there is few reports related to subcooled pool boiling using a compact vessel. In this study, to achieve a higher heat flux removing using a compact vessel, subcooled pool boiling was investigated by varying a water level, as well as microbubble emission boiling characteristics. As a result, the experimental result found that the onset of microbubble emission boiling is affected by the water level. Fig. 1 Boiling curves with or without microbubble emission boiling (MEB).130Next, boiling curve was investigated by varying the water level, as shown in fig. 6. Ivey and Morris correlation [18] at the 131 liquid subcooling of 35 K, which can predict CHF value in subcooled pool boiling, is also plotted with a solid line. The chained 132 lines show the same correlations at the liquid subcooling of 25 K and 45 K. As noted above, the degree of liquid subcooling 133 was temporary decreased to less than 20 K at 400 W/cm 2 with 8 mm because of a large fluctuation in liquid subcooling 134 (13 K at a maximum). Therefore, Ivey and Morris correlations were calculated at the degree of liquid subcooling of 135 35 K ± 10K. As a result, the CHF values were approximately corresponded to Ivey-Morris correlations. In this study, 136 when water level is higher than 10 mm, it was possible to keep the average degree of liquid subcooling at 35 K at 400 137 W/cm 2 . In contrast, the average degree of liquid subcooling was decreased to 33 K when water level is lower than 8 mm at 138 400 W/cm 2 . Moreover, MEB was not maintained and film boiling was observed at water level of 6 mm. Consequently, the 139 experimental result found that it is required to optimize the design of heat exchanger for keeping the degree of liquid subcooling 140

show abstract

“…M icro-scale and nano-scale phase change heat transport has become a popular research topic in thermal sciences due to its potential role for actively cooling current and future microelectronics 1,2 , datacenters 3,4 , energy harvesting and conversion systems 5 , and many other technologies exposed to high heat fluxes 6 . Recently, there has been growing focus on deciphering the relative importance of the different thermophysical mechanisms that dictate the cooling efficiency of a phase-change boiling and evaporation process at the macro-, micro-, and nano-scale.…”

mentioning

confidence: 99%

Transient and local two-phase heat transport at macro-scales to nano-scales

Mehrvand

Putnam

2018

Commun Phys

View full text Add to dashboard Cite

Two-phase cooling has become a promising method for improving the sustainability and efficiency of high energy-density and power-density devices. Fundamentally, however, two-phase thermal transport is not well understood for local, transient processes, especially at critical to near-critical heat fluxes at the macro, micro, and nano-scales. Here we report spatiotemporal characterization of the single-bubble ebullition cycle in a hot-spot heating configuration with heat fluxes approaching 3 kW cm −2 . In particular, we experimentally reconstruct the spatiotemporal heat transfer coefficient in terms of its proportionality at both the macro-scale (l >> 1 μm) and the micro-to-nanoscale (l < 1 μm). We show that the maximum rates of heat transfer occur during the microlayer evaporation stage of the ebullition cycle, corresponding to critical maxima in the heat transfer coefficient of~160 ± 40 kW m −2 K −1 and~5300 ± 300 kW m −2 K −1 at the macro-scale and micro-to-nanoscale, respectively.

show abstract

Application of Boiling Heat Transfer to High-Heat-Flux Cooling Technology in Power Electronics

Cited by 21 publications

References 10 publications

Experimental investigation of transition process from nucleate boiling to microbubble emission boiling under transient heating modes

Experimental investigation of transition process from nucleate boiling to microbubble emission boiling under transient heating modes

Advanced Boiling Cooling Technology Using a Compact Vessel with a Low Water Level

Transient and local two-phase heat transport at macro-scales to nano-scales

Contact Info

Product

Resources

About