Article
Thermodynamics
David A. Yaegers, Jason W. Hartwig, Chase Camarotti, J. N. Chung
Summary: This paper presents new experimental data on the wicking rate of 12 screens with liquid nitrogen and validates a room temperature based model for cryogenic nitrogen. The results suggest that the room temperature model can be used to compute wicking velocities for most screen types.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
C. F. Camarotti, J. W. Hartwig, J. N. Chung
Summary: The bubble point pressure (APBP) is the most crucial aspect in screen channel liquid acquisition device (LAD) design. Previous results have shown that using helium (GHe) pressurant can increase APBP values of cryogenic liquid nitrogen (LN2), while using gaseous nitrogen (GN2) pressurant can decrease APBP values. However, using warm pressurant always leads to a reduction in APBP regardless of the pressurant gas type. This study found a degradation in GHe APBP but no degradation in GN2 APBP at elevated pressurant bulk gas temperatures (TGB), contradicting historical trends.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
C. F. Camarotti, J. W. Hartwig, J. N. Chung
Summary: Screen channel liquid acquisition devices (LADs) are essential for future deep space travel to ensure vapor-free delivery of propellants. This paper presents cryogenic liquid nitrogen (LN2) screen channel LAD bubble point experiments and investigates the effect of pressurant gas type on LAD performance.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Xujin Qin, Chuiju Meng, Yonghua Huang
Summary: Thermodynamic vent system (TVS) is a promising method for controlling pressure in cryogenic propellant tanks in microgravity environments. A new model that considers flash evaporation effect has been developed to more accurately simulate the transient liquid-vapor phase change and heat transfer during the TVS depressurization. The model has also been used to analyze the efficiency of the TVS in reducing propellant loss and suggests that increasing heat exchanging area, reducing orifice diameter, or narrowing pressure control band can improve efficiency.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Thomas M. Conboy, Gregory W. Daines, Lucas E. O'Neill, Mark V. Zagarola, Jason W. Hartwig
Summary: Refueling spacecraft in orbit has the potential to increase payload capacity and reduce launch costs, but the challenge of acquiring vapor-free liquid propellants in microgravity conditions remains. Vane-type Propellant Management Devices (PMDs) excel in stabilizing and distributing liquid, while screen channel PMDs are less susceptible to gas ingestion and perform well at higher flow rates and adverse accelerations. To meet this need, Creare has developed a hybrid Liquid Acquisition Device (LAD) consisting of screened channels with guide vanes and a screened sump, providing a higher acquisition surface area per unit volume compared to existing designs.
Article
Thermodynamics
Alok Majumdar, Andre LeClair, Jason Hartwig, S. Mostafa Ghiaasiaan
Summary: This paper presents a computational procedure to simulate the chilldown and No Vent Filling process of a cryogenic tank using a Thermodynamic Vent System (TVS) assisted injector. The simulation includes the division of the cryogenic liquid into two streams, with a small portion passing through a Joule-Thomson valve to produce a cold mixture used to cool the main stream before injection. The chill and fill process is simulated using the Generalized Fluid System Simulation Program (GFSSP) and shows good agreement with experimental data, with discrepancies in tank pressure within 20% and filling time within 4%.
Article
Chemistry, Analytical
Jian Li, Yuan Ma, Yanzhong Li, Bin Wang, Hui Zang
Summary: This study establishes a modified model to investigate the loss of outflow rate in screen channel liquid acquisition devices (LADs) when the screen is blocked by vapor. The research finds that the total area of the blocked screen primarily determines the loss of outflow rate, while the distribution of blockage position has negligible effects. Additionally, a characteristic curve is proposed to describe the LAD's robustness against blockage, showing the impact of different parameters.
Article
Thermodynamics
Jason Hartwig, Jonathan Stephens, Noah Rhys, Justin Clark, Andre LeClair, Alok Majumdar
Summary: This paper presents an analysis of test data for a Thermodynamic Vent System (TVS) augmented injector used in cryogenic tank chilldown and fill experiments, showing that it simplifies transfer operations and enhances condensation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
C. F. Camarotti, J. W. Hartwig, H. Wang, J. N. Chung
Summary: This study focuses on the development and verification of a new model for screen compliance in screen channel liquid acquisition devices (LADs), which play a crucial role in future deep space travel. The results show that the deflection of the screen during LAD channel outflow has a significant impact on outflow demands and pressure difference.
Article
Thermodynamics
Tugberk Hakan Cetin, Jie Zhu, Ekrem Ekici, Mehmet Kanoglu
Summary: This paper proposes a combined power and cooling cogeneration system powered by geothermal energy and connected with the grid. The system integrates a turbine ejector cogeneration cycle, an air liquefaction cycle, a liquid air direct expansion cycle, and a cryogenic organic Rankine cycle. The system is able to produce a considerable amount of power and cooling capacity simultaneously, with different functionalities under different operation modes.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Mirae Kim, Heesue Jeong, Ahmad Ali Awais, Seungho Kim, Kyung Chun Kim
Summary: The thermal performance of a metal-foam heat exchanger in cryogenic environments was examined through an experiment and a CFD simulation. The results showed good agreement between the experimental data and CFD predictions, indicating that the metal-foam heat exchanger performed well in low-temperature conditions.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Xujin Qin, Peng Li, Peijie Sun, Yonghua Huang
Summary: Thermodynamic vent system (TVS) is considered a promising method for pressure control in cryogenic propellant tanks in microgravity environments. It can operate in different modes, with experimental results showing that the MV and MO modes are more effective in cooling the ullage, while the PV mode is better at suppressing liquid temperature increase. A non-dimensional parameter eta has been proposed for comparison, with the MOMV mode performing best in reducing mass loss within 0-1500 min.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Aerospace
Hamidreza Abedi, Carlos Xisto, Isak Jonsson, Tomas Gronstedt, Andrew Rolt
Summary: This paper presents a numerical framework for investigating heat management concepts using LH2 and explores the impact of using LH2 to precool and intercool the compression system. The results show that precooling and intercooling with LH2 can improve the performance of the propulsion system to a certain extent, but higher effectiveness designs may result in disproportionately higher pressure losses.
Article
Thermodynamics
Pengfei Yu, Hu Liu, Jingwen Xue, Yankang Zhang, Defu Che
Summary: The thermo-hydraulic behavior of a cryogenic printed circuit heat exchanger in the liquid air energy storage assisted by liquefied natural gas was investigated. A simplified model was built and solved using the FLUENT software, and its accuracy was validated against experimental data. The study revealed the importance of Dean vortices and secondary flow in enhancing heat transfer.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
I. P. Starodubtseva, D. Kuznetsov, A. N. Pavlenko
Summary: This study investigates the influence of structured capillary-porous coatings on cryogenic quenching process using both experiments and numerical simulations. The results show that the coating significantly affects the dynamics of quenching, reduces total quench time, and promotes earlier transition to nucleate boiling, resulting in a decrease in quenching time. The reliability of the results is confirmed through direct comparison with experimental data.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Correction
Thermodynamics
J. W. Hartwig, S. R. Darr, J. B. McQuillen, E. Rame, D. J. Chato
Article
Thermodynamics
Jason W. Hartwig, John B. McQuillen, David J. Chato
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2015)
Article
Thermodynamics
Jason Hartwig, Samuel Darr
APPLIED THERMAL ENGINEERING
(2014)
Article
Thermodynamics
David J. Chato
Article
Thermodynamics
J. W. Hartwig, D. J. Chato, J. B. McQuillen, J. Vera, M. T. Kudlac, F. D. Quinn
Article
Chemistry, Physical
Jason Hartwig, David Chato, John McQuillen
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2014)
Article
Engineering, Aerospace
Michael L. Meyer, David J. Chato, David W. Plachta, Gregory A. Zimmerli, Stephen J. Barsi, Neil T. Van Dresar, Jeffrey P. Moder
JOURNAL OF AEROSPACE ENGINEERING
(2013)
Article
Computer Science, Interdisciplinary Applications
David J. Chato
JOURNAL OF COMPUTATIONAL PHYSICS
(2009)
Article
Thermodynamics
John B. McQuillen, David J. Chato, Brian J. Motil, Michael P. Doherty, David F. Chao, Nengli Zhang
JOURNAL OF POROUS MEDIA
(2012)
Proceedings Paper
Physics, Applied
W. L. Johnson, D. J. Chato
ADVANCES IN CRYOGENIC ENGINEERING
(2020)
Proceedings Paper
Engineering, Multidisciplinary
W. L. Johnson, M. Vanderlaan, J. J. Wood, N. O. Rhys, W. Guo, S. Van Sciver, D. J. Chato
ADVANCES IN CRYOGENIC ENGINEERING
(2017)
Article
Thermodynamics
W. L. Johnson, N. T. Van Dresar, D. J. Chato, J. R. Demers