Investigation on CHF of saturated liquid nitrogen flow boiling in a horizontal small channel

Liu, Xiufang; Chen, Xingya; Zhang, Qiaoyu; Wang, Shubei; Hou, Yu; Chen, Shuangtao

doi:10.1016/j.applthermaleng.2017.07.018

Cited by 28 publications

(4 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Qi et al [44] and Callizo [45] have shown that CHF decreases with increasing mass flux due to the shear-enhanced droplet entrainment effect in vertical channels. However, for horizontal channels, the droplet entrainment effect reduces the flow instability with increasing mass flux [31]. Therefore, the CHF enhancement can be attributed to the reducing influence of flow instability and gravity effects with increasing LN 2 mass flux resulting in an increased forced convective evaporation in this work.…”

Section: Effect Of Mass Fluxmentioning

confidence: 73%

“…Mass flux is one of the strongest parameters that affects the flow boiling heat transfer performance through increased single-phase forced convection. At low mass flux conditions, gravity effect becomes important for horizontal channels [31]. In this work, the flow boiling tests have been performed in horizontal flow orientation.…”

Section: Effect Of Mass Fluxmentioning

confidence: 99%

“…Figure 8b shows the HTC enhancement with decreasing channel size (triangle to square to circle) as well as increasing mass flow rate (blue to red markers). Since the flow boiling heat transfer varies significantly from small channels to microchannels due to the influence of surface tension, time-dependent flow patterns, and bubble dynamics [31,54], it is therefore essential to first identify the classification of cooling channels utilized in this work. According to Kandlikar and Grande [54], channels are classified into seven different types based on the hydraulic diameter: conventional channels (D h > 3 mm), minichannels (200 µm < D h ≤ 3 mm), microchannels (10 µm < D h ≤ 200 µm), transitional microchannels (1 µm < D h ≤ 10 µm), transitional nanochannels (0.1 µm < D h ≤ 1 µm), and molecular nanochannels (D h ≤ 0.1 µm).…”

Section: Effect Of Channel Sizementioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2023

View full text Add to dashboard Cite

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.

show abstract

Section: Effect Of Mass Fluxmentioning

confidence: 73%

Section: Effect Of Mass Fluxmentioning

confidence: 99%

Section: Effect Of Channel Sizementioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Therefore, it has been studied and discussed in many references. 19,20 Experimental results show that cryogenic cavitation has a “frosty” appearance. 8 Hord 21 reported the experimental results of a hydrofoil under cryogenic cavitation.…”

Section: Design Methods Of Tpanmentioning

confidence: 99%

Design method of a two-phase annular nozzle in cryogenic liquid expander

Wen

Zhang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

The two-phase annular nozzle is a critical component of liquid expanders. It matches the outlet of the first stage and the inlet of the second stage. A design method of two-phase annular nozzle involving a two-step process is proposed. Nonequilibrium effects are introduced by the area factor during the second process. The flashing in two-phase annular nozzle is simulated through the cavitation method and validated by the experimental results of Brookhaven National Laboratory’s nozzle and Hord’s hydrofoil. A forward flashing two-phase annular nozzle and a backward flashing two-phase nozzle are designed with different centerline angle distributions where they show a good agreement with the design. Forward flashing two-phase annular nozzle exhibits high curvature and nonuniformity. Backward flashing two-phase nozzle exhibits lower nonuniformity and a slightly higher boundary layer ratio, which shows a better performance in terms of the nonequilibrium effects.

show abstract

Review on effect of two-phase interface morphology evolution on flow and heat transfer characteristics in confined channel

Deng

Liu

et al. 2020

Heat Mass Transfer

View full text Add to dashboard Cite

Investigation on CHF of saturated liquid nitrogen flow boiling in a horizontal small channel

Cited by 28 publications

References 44 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

Design method of a two-phase annular nozzle in cryogenic liquid expander

Review on effect of two-phase interface morphology evolution on flow and heat transfer characteristics in confined channel

Contact Info

Product

Resources

About