Article
Chemistry, Physical
Jian Li, Yanzhong Li, Yuan Ma, Lei Wang, Fushou Xie
Summary: This paper investigates the crucial role of the screen channel liquid acquisition device in the in-orbit management of liquid propellant and proposes two innovative suggestions for optimizing its design.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
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
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
Mechanics
Jiakai Zhu, Fangtai Guo, Shiqiang Zhu, Wei Song, Tiefeng Li, Xiaobin Zhang, Jason Gu
Summary: This paper proposes a fast model for predicting cryogenic cavitation using boundary conditions. The model combines simple theories and neural networks to infer hidden physical features from the boundary conditions. It is trained and validated using experimental measurements and shows promising accuracy for new boundary conditions and locations. The model has the potential for predicting cavitation in unseen cryogenic liquids or over new geometries without retraining.
Article
Energy & Fuels
Nazmul Abedin Khan, Sung Hwa Jhung
Summary: Highly porous polyaniline-derived carbons were used as adsorbents for the first time to remove hazardous organonitrogens from liquid fuel. The pDCs showed high adsorption capacities, especially the pDC-700 prepared at 700 degrees C. The high adsorption capacities can be explained by efficient hydrogen bonding and high microporosity of the adsorbent. Moreover, the pDC-700 can be regenerated for successive utilization through solvent washing.
Article
Engineering, Aerospace
Chase Camarotti, Jason Hartwig, David Yaegers, Siddhartha Vasireddy, Jacob Chung
Summary: In the microgravity environment of space, liquid acquisition devices (LADs) are used to separate and control liquid and vapor phases of propellant. This study investigates the effect of different ramp rates on the compliance of LAD screens with rectangular geometries.
MICROGRAVITY SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Siddhartha Vasireddy, Chase Camarotti, Jason Hartwig, J. N. Chung
Summary: Screen channel liquid acquisition devices (LADs) are used to separate liquid and vapor phases in space. This study experimentally measures the pressure difference and deflection thickness of the screen to calculate the compliance coefficient.
MICROGRAVITY SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
A. A. Boryaev, I. O. Chernyaev, Zhu Yuqing
Summary: This paper presents the experimental and theoretical studies on heat and mass transfer parameters, as well as hydrodynamic processes in cryogenic hydrogen tanks and feeding systems. The relationships obtained from the research can be used as reference data for the design and optimization of LH2 fuel systems.
Article
Thermodynamics
Jian Li, Yanzhong Li, Yuan Ma, Lei Wang, Fushou Xie
Summary: This study focuses on the bubble point pressure (BPP) of Dutch Twill weave (DTW) screens for gas-liquid separation. The two-stage-bubble-point pressure phenomenon was discovered in experiments, revealing the importance of three new parameters: the first order BPP, the second order BPP, and the critical depressurizing level. The microstructure of DTW screens was analyzed and a new conceptual model was proposed to explain the phenomenon. The mechanism was further quantitatively illustrated through CFD simulation. This discovery highlights the importance of reducing the driving pressure below the critical depressurizing level to fully restore the performance of the screen after a bubble breakthrough.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Physical
Shuai Hou, Mengmeng Du, Ping Xu, Zixuan Rao, Yunhe Zou, Yang Lei, Lan Yuan, Yi Liu, Fen Guo
Summary: A fuel cell-electrolyzer series device with MEA as fuel has been developed, and an Au?Ni@Ni foam anode prepared by optimized electrodeposition method shows excellent performance in MEA degradation and hydrogen production.
JOURNAL OF POWER SOURCES
(2021)
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
Chemistry, Physical
Sixian Wu, Yonglin Ju
Summary: As emission standards become stricter, more vessels are opting to use LNG as fuel. However, external sloshing excitation from the ocean can cause rapid pressure drops in the fuel tank, leading to engine shutdown. In this paper, a computational fluid dynamic (CFD) model is developed to predict the pressure drop and thermal response in LNG fuel tanks under sinusoidal excitation. The CFD model is validated using fluid sloshing experiments. The results show that sloshing enhances heat and mass transfer, promotes pressure drop, and leads to uniform temperature distribution in the tank. The influence of sloshing excitation on heat and mass transfer is theoretically analyzed, and a simplified method is proposed for the complex phase change problem in cryogenic tanks under sloshing conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Alberto Boretti
Summary: Dual fuel internal combustion engines utilizing diesel and hydrogen aim to achieve diesel-like power density and fuel conversion efficiency, while improving emissions performance. By using a high-pressure hydrogen injector and super-turbocharging technology, higher efficiency and performance can be achieved.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Oladapo Christopher Esan, Xingyi Shi, Zhefei Pan, Yun Liu, Xiaoyu Huo, Liang An, T. S. Zhao
Summary: This study investigates the performance and operation of a novel H2O2-based fuel cell. The e-fuel/H2O2 fuel cell shows higher power density and current density than using oxygen, making it a promising power source in airtight environments.
JOURNAL OF POWER SOURCES
(2022)
Article
Thermodynamics
Wang Bo, Luo Ruoyin, Chen Hong, Zheng Chen, Gao Yunfei, Wang Haoren, Hashmi Abdul Rehman, Zhao Qinyu, Zhihua Gan
Summary: A new method for characterizing the vacuum pressure of tank containers with MLI is proposed, showing that the temperature of the outer surface of the MLI material is a good indicator of the vacuum pressure inside the tanks. Experimental verification and theoretical analysis confirmed the relationship between temperature and vacuum pressure.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
S. R. Darr, Hong Hu, N. G. Glikin, J. W. Hartwig, A. K. Majumdar, A. C. Leclair, J. N. Chung
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2016)
Article
Thermodynamics
Jason Hartwig, Samuel Darr, Anthony Asencio
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2016)
Article
Multidisciplinary Sciences
Samuel Darr, Jun Dong, Neil Glikin, Jason Hartwig, Alok Majumdar, Andre Leclair, Jacob Chung
Article
Mechanics
S. R. Darr, C. F. Camarotti, J. W. Hartwig, J. N. Chung
Article
Thermodynamics
Jason Hartwig, Samuel Darr
APPLIED THERMAL ENGINEERING
(2014)
Article
Thermodynamics
Chase Camarotti, Oscar Deng, Samuel Darr, Jason Hartwig, J. N. Chung
APPLIED THERMAL ENGINEERING
(2019)
Article
Thermodynamics
J. N. Chung, S. R. Darr, Jun Dong, Hao Wang, J. W. Hartwig
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2020)
