Experimental investigation of nitrogen flow boiling heat transfer in a single mini-channel

Zhang, Beichen; Li, Qinglian; Wang, Yuan; Zhang, Jianqiang; Song, Jie; Zhuang, Fengchen

doi:10.1631/jzus.a1900468

Cited by 25 publications

(5 citation statements)

References 52 publications

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“…This has also been observed in mini channels by other researchers, such as Balasubramanian et al [37] and Bertsch et al [38]. Furthermore, Zhang et al [36] have shown that the HTC decreases with increasing mass flux due to the suppression of nucleate boiling in the intermediate mass flux regimes. Therefore, the HTC decreasing trend of boiling curve for the dark blue squares as compared to the dark green squares can be attributed to the suppression of augmented nucleate boiling, however, there exist the contribution from enhanced forced convective evaporation.…”

Section: Effect Of Mass Fluxsupporting

confidence: 70%

“…However, with a further increase in LN 2 flow rate at 47 cm 3 /s (dark blue squares), the boiling curve can be seen shifting to the right as compared to the 38 cm 3 /s flow rate (dark green squares) curve. Zhang et al [36] have observed the collapse of boiling curves at various mass flux values in a vertical mini channel for LN 2 due to the significance of nucleate boiling through the consumption of latent heat. This has also been observed in mini channels by other researchers, such as Balasubramanian et al [37] and Bertsch et al [38].…”

Section: Effect Of Mass Fluxmentioning

confidence: 99%

“…On the contrary, Charnay et al [48,49] have presented that high pressure leads to increase in liquid film thickness and decrease in vapor quality resulting in a decrease in CHF. Furthermore, Zhang et al [36] have shown that heat transfer deteriorates with increasing inlet pressure due to the reduction in surface tension resulting in the earlier appearance of an unsteady annular flow regime. Additionally, the standard thermophysical properties of LN 2 shows that the latent heat of vaporization also decreases with increasing operating pressure, and phase change heat transfer is a strong function of the latent heat of vaporization.…”

Section: Effect Of Mass Fluxmentioning

confidence: 99%

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Liquid Nitrogen Flow Boiling Critical Heat Flux in Additively Manufactured Cooling Channels

et al. 2023

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This paper presents an experimental characterization of liquid nitrogen (LN2) flow boiling in additively manufactured minichannels. There is a pressing need of concerted efforts from the space exploration and thermal transport communities to design high-performance rocket engine cooling channels. A close observation of the literature gaps warrants a systematic cryogenic flow boiling characterization of asymmetrically heated small (<3 mm) non-circular channels fabricated with advanced manufacturing technologies at mass flux > 3000 kg/m2s and pressure > 1 MPa. As such, this work presents the LN2 flow boiling results for three asymmetrically heated additively manufactured GR-Cop42 channels of 1.8 mm, 2.3 mm, and 2.5 mm hydraulic diameters. Twenty different tests have been performed at mass flux~3805–14,295 kg/m2s, pressures~1.38 and 1.59 MPa, and subcooling~0 and 5 K. A maximum departure from nucleate boiling (DNB)-type critical heat flux (CHF) of 768 kW/m2 has been achieved for the 1.8 mm channel. The experimental results show that CHF increases with increasing LN2 flow rate (337–459 kW/m2 at 25–57 cm3/s for 2.3 mm channel) and decreasing channel size (307–768 kW/m2 for 2.5–1.8 mm channel). Finally, an experimental DNB correlation has been developed with 10.68% mean absolute error.

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Section: Effect Of Mass Fluxsupporting

confidence: 70%

Section: Effect Of Mass Fluxmentioning

confidence: 99%

Section: Effect Of Mass Fluxmentioning

confidence: 99%

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Liquid Nitrogen Flow Boiling Critical Heat Flux in Additively Manufactured Cooling Channels

et al. 2023

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“…Microfluidics systems have obvious advantages, such as low cost, small space, high precision and effective flow control. It is widely used in various fields, including medicine [ 4 ], chemistry [ 5 ], and biomedicine [ 6 ], etc. In recent years, with the vigorous development of microfluidic technology, microfluidic valves have received extensive attention due to their precise control of microfluidics and low-cost fabrication, such as point-of-care tests (POCT) of tumor marker proteins [ 7 ], unidirectional transport of nanofluids [ 8 , 9 , 10 ], sweat collection microdevice for sweat colorimetric (AST) [ 11 ], rapid and accurate antibiotic-susceptibility testing [ 12 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Flow Regulation Performance Analysis of Microfluidic Passive Valve for High Throughput Liquid Delivery

Chen

et al. 2022

Micromachines

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A microfluidic passive valve (MPV) is important for precise flow control, and it determines the reliability of the microfluidic system. In this paper, a novel MPV capable of delivering a constant flow rate independently of inlet pressure changes is proposed. The flow rate of the MPV is adjusted by the difference between the fluid force on the upper surface of the valve core and the spring force. The constant flow rate of the MPV is maintained by automatically changing the size of the gap channel formed by the groove on the valve core and the baffle on the valve body. The nearly constant flow rate of the MPV is 6.26 mL/min, with a variation of 6.5% under the inlet pressure varied from 1.25 kPa to 3.5 kPa. In addition, the flow characteristics of the MPV are analyzed by numerical simulation. With the increase in the inlet pressure, the maximum velocity gradually increases, while the increment of the maximum velocity decreases. In the movement process of the valve core, the region of pressure drop becomes larger. This work has a certain reference value for the design and research of the MPVs with high throughput liquid delivery.

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“…Microscale heat transfer devices are three-dimensional structures manufactured by means of specific micromachining technologies [3][4][5]. With the satisfactory heat transfer capability, compact structure, and relatively light weight, the microchannel heat sink (MCHS) can be regarded as a suitable and feasible solution to meet the heat dissipation requirement [6,7].…”

Section: Introductionmentioning

confidence: 99%

Hydraulic and Thermal Performance of Microchannel Heat Sink Inserted with Pin Fins

et al. 2021

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With the development of micromachining technologies, a wider use of microchannel heat sink (MCHS) is achieved in many fields, especially for cooling electronic chips. A microchannel with a width of 500 μm and a height of 500 μm is investigated through the numerical simulation method. Pin fins are arranged at an inclined angle of 0°, 30°, 45°, and 60°, when arrangement method includes in-lined pattern and staggered pattern. The effects of inclined angle and arrangement method on flow field and temperature field of MCHSs are studied when Reynolds number ranges from 10 to 300. In addition to this, quantitative analyses of hydraulic and thermal performance are also discussed in this work. With the increase of inclined angle, the variation of friction factor and Nusselt number do not follow certain rules. The best thermal performance is achieved in MCHS with in-lined fines at an inclined angle of 30° accompanied with the largest friction factor. Arrangement method of pin fins plays a less significant role compared with inclined angle from a general view, particularly in the Reynolds number range of 100 ~300.

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Experimental investigation of nitrogen flow boiling heat transfer in a single mini-channel

Cited by 25 publications

References 52 publications

Liquid Nitrogen Flow Boiling Critical Heat Flux in Additively Manufactured Cooling Channels

Liquid Nitrogen Flow Boiling Critical Heat Flux in Additively Manufactured Cooling Channels

Flow Regulation Performance Analysis of Microfluidic Passive Valve for High Throughput Liquid Delivery

Hydraulic and Thermal Performance of Microchannel Heat Sink Inserted with Pin Fins

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