Investigation on heat transfer in line chill-down process with various cryogenic fluids

Jin, Lingxue; Lee, Jisung; Jeong, Sangkwon

doi:10.1016/j.ijheatmasstransfer.2019.119204

Cited by 26 publications

(8 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A series of visual studies have been put forward [9,10], and based on them, a series of phenomenological models have been set up to model the cryogenic chill-down process [11,12]. For setting up more reliable model, recently, a number of experimental studies have been performed [13][14][15][16][17][18][19][20][21] to correlate the heat transfer coefficients for various boiling patterns and boiling transition points (LFP, CHF). It is believed that in the current stage, correlations approved by Darr et al [15,16] could obtain general applications for transport pipe.…”

Section: Introductionmentioning

confidence: 99%

Fill-In and Boiling Transition Characteristics during the Liquid Oxygen Chill-Down Process in a Vertical Exit-Contracted Pipe

Zhang

Wang

Chen

2022

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

Liquid oxygen chill-down in a vertical exit-contracted pipe was investigated experimentally. The wall temperatures were recorded in detail to describe the filling and chill-down process of the experimental section. Two quenching fronts, the exit one and the inlet one, were detected, and their propagations were found. Results show that the chill-down process is controlled mainly by the formation and propagation of quenching front, which are determined by the pressure level. With the increase of pressure, the roles of both propagation of quenching front and inlet quenching front undergo decreasing. On the vertical section, the effect of circumferential position was discussed in detail and the dominant point was identified, which determines the boiling transition time of the dominated points on the current cross-section. Based on the experimental data, two correlations were suggested for dominant point and dominated points, respectively, to predict heat flux on Leidenfrost, heat transfer coefficient on Leidenfrost, and critical heat flux. One equation was approved to predict heat transfer coefficient on critical heat flux point for both sorts of points. All of these correlations could produce reliable predictions.

show abstract

Section: Introductionmentioning

confidence: 99%

Fill-In and Boiling Transition Characteristics during the Liquid Oxygen Chill-Down Process in a Vertical Exit-Contracted Pipe

Zhang

Wang

Chen

2022

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

show abstract

“…At present, a series of studies have been carried out on the chilling of cryogenic pipelines. Jin et al [10][11][12][13] carried out a series of liquid nitrogen tests and simulation studies on long pipelines and proposed some heat transfer correlations. Hu et al [14] carried out the observation of liquid oxygen chilling flow patterns in 8 mm vertical pipelines and captured several flow patterns and developments of the quenching front.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Flow Development and Boiling Transitions in the Liquid Oxygen Chill-Down Process in a Straight Horizontal Exit-Contracted Pipe

Chen

Zhang

2023

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

Liquid oxygen chill-down in a straight horizontal pipe was studied experimentally. The effect of the entrance corner was excluded, and much denser wall temperature sensors along the pipe have been set compared to the present studies. In this way, the chill-down process, as well as the development of the flow pattern, has been drawn for every test. As a result, the mechanism of LO2 chill-down would be obtained for various pressure sections. For cases with stable pressure below 1.25 MPa, liquid rewetting in the pipe is controlled by the propagation of quenching fronts. For cases with a higher pressure, liquid rewetting in the second half of the pipe is controlled by the sudden liquid fill-in. Based on the transition points obtained, heat transfer coefficients on the Leidenfrost point and critical heat flux have been correlated for various pressure sections using new approaches. Conclusions show that the correlation equations are dependent on the chill-down mechanisms.

show abstract

“…Mass flux was reported to having a significant influence on the chill-down time and efficiency. Lingxue Jin et al [7,8] performed experiments using a stainless-steel test section with LAr, LOX and LN2. Chilldown time was reported to be less with LN2 compared to LAr.…”

Section: Introductionmentioning

confidence: 99%

Studies to Investigate the Effect of Feed Line Orientation on Chill-Down Performance of Cryogenic Feed Lines

2023

5th ISSE National Conference (INAC-05) on Systems Approach for Self-Reliance in Advanced Technologies

View full text Add to dashboard Cite

In Cryogenic Systems, chilldown of transfer or feed lines to a temperature very close to that of the cryogen is to be achieved first prior to its admission at rated flow rate for steady state operation and this is achieved by admitting the cryogen at a low flow rate. This chilldown process is very complex and is highly sensitive to parameters like feed line orientation, distribution of thermal mass associated with the system, mass flux of the cryogen, heat in-leak etc. In the present study, experiments are conceived to address the influence of feed line orientation on chilldown performance. A set-up is realised employing a foam insulated test section and experiments are conducted using Liquid Nitrogen. Tests are performed in horizontal and different upward as well as downward orientation. Chill down performance is analysed using the measured surface temperature data. It is observed to be very sensitive to feed line orientation, faster with upward inclination and slower with downward orientation. Wall heat flux is estimated using experimental data and heat flux pattern for different feed line orientation is studied. Heat flux pattern at bottom locations is observed to be not affected significantly by feed line orientation. Whereas heat flux pattern at top locations is distinctly different in tests with upward orientation. CFD simulation is also done, as a typical case, for 45 o downward inclination, using ANSYS software to capture the flow pattern and wall temperature profile. Flow structure is well captured and very good match is seen with the experimental data for the bottom wall temperature profile.

show abstract

Investigation on heat transfer in line chill-down process with various cryogenic fluids

Cited by 26 publications

References 28 publications

Fill-In and Boiling Transition Characteristics during the Liquid Oxygen Chill-Down Process in a Vertical Exit-Contracted Pipe

Fill-In and Boiling Transition Characteristics during the Liquid Oxygen Chill-Down Process in a Vertical Exit-Contracted Pipe

Characteristics of Flow Development and Boiling Transitions in the Liquid Oxygen Chill-Down Process in a Straight Horizontal Exit-Contracted Pipe

Studies to Investigate the Effect of Feed Line Orientation on Chill-Down Performance of Cryogenic Feed Lines

Contact Info

Product

Resources

About