Flow boiling of ammonia and flow instabilities in mini-channels

Kuang, Yiwu; Wang, Wen; Miao, Jun; Yu, Xingang; Zhang, H.X.; Zhuan, Rui

doi:10.1016/j.applthermaleng.2016.11.093

Cited by 35 publications

(10 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The investigation results and the division of these four stages are in accord with the results obtained by other researchers …”

Section: Experimental Setup and Bubble Growth Characteristics Of Boilsupporting

confidence: 91%

“…From the onset of the bubble to the time when the sensing section is filled with vapor, it lasts only about 12.5 ms. That means the boiling process is much faster than the steady measurement process in the field of analytic chemistry. The response speed of the conventional CCD sensor cannot meet the requirement of the online monitoring of boiling process in mini‐channels . A new CCD sensor should be developed.…”

Section: Experimental Setup and Bubble Growth Characteristics Of Boilmentioning

confidence: 99%

“…For a mini‐channel heat exchanger, boiling is a common phenomenon. Since the heat performance and safety of a mini‐channel exchanger is strongly linked to the different boiling stages/states which reflect different bubble behaviors and heat transfer characteristics, the online monitoring of boiling process is of great importance for the operational heat transfer efficiency and stability of a mini‐channel heat exchanger …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A new method for online monitoring of boiling process in mini‐channels

et al. 2019

AIChE Journal

View full text Add to dashboard Cite

A new method for online monitoring of boiling process, which is suitable for conductive fluids in mini‐channels, is proposed with the introduction of contactless conductivity detection (CCD) technique and perceptron algorithm (PA) technique. Series resonance principle and simulated inductor technique were adopted to develop a new CCD sensor. PA was used to implement the boiling stage identification, i.e., to identify the current stage was which stage of the boiling process. Three prototypes of the CCD sensors with inner diameters of 1.6, 2.0, and 2.5 mm were developed. With three kinds of conductive fluids (tap water, ethanol–tap water mixture, and KCl solution), boiling experiments were carried out. The experimental results show that the CCD sensor can effectively track the bubble growth of boiling process. The research results also indicate that the proposed method is effective and the identification accuracies are greater than 90.0%. © 2019 American Institute of Chemical Engineers AIChE J, 65: 1365–1375, 2019

show abstract

“…The investigation results and the division of these four stages are in accord with the results obtained by other researchers …”

Section: Experimental Setup and Bubble Growth Characteristics Of Boilsupporting

confidence: 91%

Section: Experimental Setup and Bubble Growth Characteristics Of Boilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A new method for online monitoring of boiling process in mini‐channels

et al. 2019

AIChE Journal

View full text Add to dashboard Cite

show abstract

“…They observed flow instabilities when approaching CHF, which altered the inlet coolant temperature. Kuang et al [11] observed periodic reversed flows even in minichannels of 1.1 mm. Several researchers have developed solutions that mitigate flow reversals.…”

Section: Issues Faced In Mini and Microchannels And Proposed Solutionsmentioning

confidence: 99%

Experimental study of flow boiling of FC-72 in fractal-like flow channels

See

Leong

2019

International Journal of Thermal Sciences

View full text Add to dashboard Cite

“…They found that previous models for pressure drop developed with other refrigerants were unable to accurately predict ammonia flow boiling behavior due to the vastly different fluid properties. Kuang et al [40] conducted both visualization and measurement studies in which the heat transfer characteristics of ammonia flow boiling were not involved to study the flow boiling instabilities and flow patterns in microchannels (dh=1050 μm). In 2015, Wang and Fang [41] compiled an extensive database of ammonia flow boiling containing 1157 data points to evaluate 37 available correlations.…”

Section: Tablementioning

confidence: 99%

A diamond made microchannel heat sink for high-density heat flux dissipation

Yang

Zhao

Huang

et al. 2019

Applied Thermal Engineering

View full text Add to dashboard Cite

Flow boiling in microchannels is a promising technique for cooling high power-density electronic devices. In this study, a microchannel heat sink using ammonia as working fluid is developed, and its cooling efficiency is experimentally investigated under nonuniform high-density heat flux, which well simulates a practical heat dissipation scenario for microthermal systems. Diamond with high thermal conductivity of 1500 W/mK is selected as the microchannel heat sink material. A total of 37 parallel triangular microchannels with aspect ratio of 5, channel length of 45 mm and hydraulic diameter of 280 μm are uniformly engineered on the diamond film by laser ablation processing. The significance of diamond substrate as a heat spreader to minimize the nonuniformity of heat flux imposed by a central hotspot is verified. The influences of heat flux and mass flux on the cooling efficiency are experimentally investigated. An optimal range of outlet vapor quality from 0.10 to 0.13 is found, within which the minimum heat source temperature can be achieved. Notably, the microchannel heat sink is capable of managing a central hotspot with heat flux of 267 W/cm 2 while maintaining the heat source temperature at 53.3 °C for a mass flux of 320kg/m 2 s.

show abstract

Flow boiling of ammonia and flow instabilities in mini-channels

Cited by 35 publications

References 36 publications

A new method for online monitoring of boiling process in mini‐channels

A new method for online monitoring of boiling process in mini‐channels

Experimental study of flow boiling of FC-72 in fractal-like flow channels

A diamond made microchannel heat sink for high-density heat flux dissipation

Contact Info

Product

Resources

About