Microgravity Science and Technology最新文献_第10页

Study on the Influence of the Microgravity on the Flow and Heat Transfer Characteristics of Gas–Liquid Two-Phase Flow in Evaporator 微重力对蒸发器内气液两相流流动及传热特性影响的研究

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-11-29 DOI: 10.1007/s12217-023-10084-7

Rui Ma, Jiamin Guo, Yilin Ye, Yuting Wu

{"title":"Study on the Influence of the Microgravity on the Flow and Heat Transfer Characteristics of Gas–Liquid Two-Phase Flow in Evaporator","authors":"Rui Ma, Jiamin Guo, Yilin Ye, Yuting Wu","doi":"10.1007/s12217-023-10084-7","DOIUrl":"10.1007/s12217-023-10084-7","url":null,"abstract":"<div><p>In a microgravity environment, the flow pattern, flow characteristics, and heat transfer characteristics of gas–liquid two-phase flow are different from those in a normal gravity environment. To study the influence of microgravity on the flow and heat-transfer characteristics in an evaporator, this study develops a flow and heat-transfer model in an evaporator based on a previously proposed microgravity solution where the refrigerant and lubricating oil are mixed. This work also examines the flow and heat-transfer characteristics of gas–liquid two-phase flow in an evaporator with gravity of 10<sup>–6</sup>-10<sup>−3</sup> g and studies the influence of lubricating-oil content on the flow and heat-transfer characteristics of mixed two-phase flow in the evaporator. The results show that when gravity is equal to 10<sup>−3</sup> g, the gas volume fraction at the outlet is between 0.6 and 0.7, and when gravity is decreased to 10<sup>–6</sup> g, the gas volume fraction at the outlet of the evaporator, after gradually decreasing, comes close to a zero gravity-state. In addition, the gas volume fraction remains between 0.3 and 0.6. It can also be seen that when gravity increases, the heat-transfer coefficient increases nearly linearly and reaches a maximum value of 14.013 W/(m<sup>2</sup>·K) and 16.066 W/(m<sup>2</sup>·K) when the lubricating oil content is 2% for normal gravity, and 4.443 W/(m<sup>2</sup>·K) and 5.519 W/(m<sup>2</sup>·K) when the lubricating oil content is 2.5% for microgravity.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138468350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Expansion and Experimental Evaluation of Scaling Relations for the Prediction of Wheel Performance in Reduced Gravity 减重状态下车轮性能预测标度关系的扩展与实验评价

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-11-24 DOI: 10.1007/s12217-023-10087-4

Adriana Daca, Dominique Tremblay, Krzysztof Skonieczny

{"title":"Expansion and Experimental Evaluation of Scaling Relations for the Prediction of Wheel Performance in Reduced Gravity","authors":"Adriana Daca, Dominique Tremblay, Krzysztof Skonieczny","doi":"10.1007/s12217-023-10087-4","DOIUrl":"10.1007/s12217-023-10087-4","url":null,"abstract":"<div><p>Traversing granular regolith, especially in reduced gravity environments, remains a potential challenge for wheeled rovers. Mitigating hazards for planetary exploration rovers requires testing in representative environments, but direct Earth-based testing fails to account for the effect of reduced gravity on the soil itself. Granular scaling laws (GSL) have been proposed in the literature to predict performance of a larger wheel based on tests with a smaller wheel, or to predict performance in one gravity level based on tests in another gravity level. However, this is the first work to experimentally validate GSL in reduced gravity. Here, an expanded version of existing GSL was evaluated experimentally by measuring performance of a single wheel driving through cohesionless lunar soil simulant GRC-1 aboard parabolic flights that reproduce the effects of lunar gravity, and comparing those results to scaled tests performed on the ground. This scaled-wheel testing achieved less than 10% prediction error on three measured output metrics: drawbar pull (i.e. net traction), sinkage, and power draw. Predictions also erred on the conservative side. Subsurface soil imaging revealed similar soil behavior between scaled tests. GSL thus offers an accurate and conservative method for predicting wheel performance in reduced gravity based on 1-g experiments, at least in cohesionless soil.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138436217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gravity Unloading Method of Membrane Phased-array Antennas Using Electrostatic Adsorption 膜相控阵天线的静电吸附重力卸载方法

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-11-22 DOI: 10.1007/s12217-023-10083-8

Wang Zhong, Jichuan Xiong, Yiqun Zhang

引用次数: 0

Preparation and Performance Characterization of Copper and Diamond Filled Composite Thermal Conductivity Materials 铜-金刚石复合导热材料的制备及性能表征

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-11-17 DOI: 10.1007/s12217-023-10082-9

Shuai Wang, Xiang Ma, Quan Gao, Jinyu Wang, Na Xu, Yonghai Zhang, Jinjia Wei, Jianfu Zhao, Bin Li

{"title":"Preparation and Performance Characterization of Copper and Diamond Filled Composite Thermal Conductivity Materials","authors":"Shuai Wang, Xiang Ma, Quan Gao, Jinyu Wang, Na Xu, Yonghai Zhang, Jinjia Wei, Jianfu Zhao, Bin Li","doi":"10.1007/s12217-023-10082-9","DOIUrl":"10.1007/s12217-023-10082-9","url":null,"abstract":"<div><p>An experimental investigation was conducted to prepare and study the thermal conductivity performance of copper and diamond composite materials. Copper powder and diamond particles were used as fillers, epoxy resin was used as matrix, and composite materials were prepared by vacuum-assisted mechanical stirring. The thermal expansion coefficient of different composite materials was measured by a laser flash method, which can be used to calculate the thermal conductivity. The effect of the filling rate of copper powder, the morphology of copper powder, the filling rate of diamond, and the thermal conductivity of the particles on the thermal conductivity of composite materials was studied. The results showed that thermal conductivity of copper powder and diamond particles composite materials were 874% and 535% higher than that of the epoxy resin when their filling rates were 50.3 vol.% and 40.0 vol.%, respectively. For two-dimensional flake copper powder materials, the thermal conductivity could be effectively improved at a lower filling rate. However, the flake particles were easy to aggregate at a high filling rate, which maybe cause the composite materials to pulverize.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on the Driving Simulation Method of a Manned Lunar Rover System for Somatosensory Representation 载人月球车系统体感表征驱动仿真方法研究

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-11-03 DOI: 10.1007/s12217-023-10078-5

Qihang Yu, Dianliang Wu, Shunzhou Huang, Hanzhong Xu, Yue Zhao, Huanchong Cheng

{"title":"Research on the Driving Simulation Method of a Manned Lunar Rover System for Somatosensory Representation","authors":"Qihang Yu, Dianliang Wu, Shunzhou Huang, Hanzhong Xu, Yue Zhao, Huanchong Cheng","doi":"10.1007/s12217-023-10078-5","DOIUrl":"10.1007/s12217-023-10078-5","url":null,"abstract":"<div><p>During the lunar surface activities of the manned lunar landing project, the design verification and driving training of the manned lunar rover system should be carried out according to the requirements of space mission verification and astronaut comprehensive operation training. In this case, it is difficult to conduct somatosensory simulation of human rover driving training in the lunar surface environment. To solve the above problems, first, the characteristics of astronaut motion sensing information reception were analyzed, the lunar surface environment was created in the virtual environment, the lunar gravity conditions were established, and the dynamics model of the man-vehicle-moon system was established for motion sensing simulation. Then, the parameters of the somatosensory model are provided by dynamics calculation, and the astronaut's attitude adjustment is considered to simulate and verify the somatosensory model. Finally, the motion characteristics of astronauts driving on the Moon are analyzed, which provides support for the design verification and driving operation training of manned lunar rovers.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-023-10078-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134795502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermodynamic Evaluation of the Surface Tension and Viscosity of Liquid Quaternary Alloys: The Ti-Al-Cr-Nb System 液态季系合金表面张力和粘度的热力学评价:Ti-Al-Cr-Nb体系

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-10-26 DOI: 10.1007/s12217-023-10080-x

Rada Novakovic, Donatella Giuranno, Markus Mohr, Hans-Jöerg Fecht

{"title":"Thermodynamic Evaluation of the Surface Tension and Viscosity of Liquid Quaternary Alloys: The Ti-Al-Cr-Nb System","authors":"Rada Novakovic, Donatella Giuranno, Markus Mohr, Hans-Jöerg Fecht","doi":"10.1007/s12217-023-10080-x","DOIUrl":"10.1007/s12217-023-10080-x","url":null,"abstract":"<div><p>Surface tension and viscosity of complex Ti-based industrial alloys are important for simulation of liquid assisted industrial processes such as casting, joining, crystal growth and infiltration. Modelling of the interface and mass transport during liquid-solid phase transition requires reliable surface tension and viscosity data. Therefore, to obtain accurate predictions of microstructural evolution during solidification related processes, only reliable input data are necessary. In the case of liquid Ti-Al alloys, the experimental difficulties related to high temperature measurements and reactivity of these alloys with supporting materials or containers as well as inevitable presence of oxygen may lead to data gaps including a complete lack of property data. An alternative for container-based methods are containerless processing techniques that offer a significant accuracy improvement and / or make possible to measure temperature and composition dependent thermophysical properties of metallic melts, as in the case of the Ti-Al-Cr-Nb system. Advanced mathematical models and computer simulations, developed in several theoretical frameworks, can be used to compensate the missing data; on the other side, for the validation of theoretical models, the experimental data are used. In the present work, an evaluation of the surface tension and viscosity of liquid Ti-Al-Cr-Nb alloys by means of the predictive models and a comparison to the available experimental data were done. The proposed methodology is a tool to assess the reliability of thermophysical properties data of multicomponent alloy systems.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-023-10080-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comment on the Paper Numerical Simulation for Magneto Nanofluid Flow Through a Porous Space with Melting Heat Transfer, T. Hayat, Faisal Shah, A. Alsaedi, M. Waqas, Microgravity Science and Technology (2018) 30:265–275 对论文《磁性纳米流体流经多孔空间的数值模拟与熔融传热》的评论，T. Hayat, Faisal Shah, A. Alsaedi, M. Waqas, 《微重力科学与技术》（2018）30:265-275

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-10-19 DOI: 10.1007/s12217-023-10079-4

Asterios Pantokratoras

引用次数: 0

Comparison of Effects of 2D and 3D Simulated Microgravity Rotation on Ossification in Larval Danio Rerio (Zebrafish) 二维和三维模拟微重力旋转对斑马鱼幼鱼骨化的影响比较

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-10-11 DOI: 10.1007/s12217-023-10077-6

Jordan Eaton, Juan D. Carvajal-Agudelo, Tamara A. Franz-Odendaal

{"title":"Comparison of Effects of 2D and 3D Simulated Microgravity Rotation on Ossification in Larval Danio Rerio (Zebrafish)","authors":"Jordan Eaton, Juan D. Carvajal-Agudelo, Tamara A. Franz-Odendaal","doi":"10.1007/s12217-023-10077-6","DOIUrl":"10.1007/s12217-023-10077-6","url":null,"abstract":"<div><p>Simulated microgravity (SMG) is an environmental condition that affects bone density in vertebrates. Ground-based studies typically use a random positioning machine in either a 2D or a 3D mode to assess the effects of SMG, however the meaning of these results is difficult to compare between studies due to different experimental parameters. Here, we exposed larval <i>Danio rerio</i> at 3dpf to 23 h of SMG using a 2D and a 3D mode of rotation, using the same experimental setup. Zebrafish larvae were anaesthetized during the experiment. Our results showed that anesthesia (MS222) did not affect the amount of ossification while SMG-2D treatment slightly reduced the amount of ossification compared with the controls. On the other hand, SMG-3D treatment significantly reduced the overall ossification level of the skeleton. Specifically, the anterior end of the notochord, the ceratobranchial-5, the lower jaw articulation, the pharyngeal teeth, and the operculum were affected compared with control treatments. Overall, these results indicate that SMG-3D produced a more effective SMG effect compared with the SMG-2D. This research provides valuable insight into how different external stimuli such as SMG can cause negative effects on ossification in the developing skeleton in zebrafish.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134796230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance Assessment Framework for Multirotor Unmanned Aerial Vehicle Microgravity Platforms 多旋翼无人机微重力平台性能评估框架

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-09-27 DOI: 10.1007/s12217-023-10074-9

Siddhardha Kedarisetty, Joel George Manathara

{"title":"Performance Assessment Framework for Multirotor Unmanned Aerial Vehicle Microgravity Platforms","authors":"Siddhardha Kedarisetty, Joel George Manathara","doi":"10.1007/s12217-023-10074-9","DOIUrl":"10.1007/s12217-023-10074-9","url":null,"abstract":"<div><p>This paper presents a method to analyse multirotor unmanned aerial vehicles (MUAVs) as microgravity platforms. MUAVs can maintain a free-fall state and provide microgravity owing to their precise thrust control abilities. Moreover, MUAVs are affordable platforms that can be procured at low-cost. Although several MUAVs of various sizes and configurations exist, their capabilities as microgravity platforms are not readily available. Towards this, a framework is developed to estimate microgravity performance measures such as 0<i>g</i>-time, payload capacity, and 0<i>g</i>-quality for a given MUAV. The proposed estimation framework requires only the data provided by the MUAV manufacturer to compute all the microgravity performance measures. The performance as a microgravity platform of several existing MUAVs of various configurations, masses, sizes, and thrust capabilities is estimated by employing this framework. This analysis reveals that there exist MUAVs that can provide microgravity (of the order of <span>(10^{-2}g)</span>) for more than 4 s 0<i>g</i>-time while carrying more than 1 kg payloads. On the other hand, it is also shown that some MUAVs can carry payloads heavier than 90 kgs and provide microgravity for 2 s, which is comparable to the capability of some of the drop tower facilities.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermocapillary Convection of Evaporating Thin Nanofluid Layer in a Rectangular Cavity 矩形空腔中蒸发纳米流体薄层的热毛细对流

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-09-25 DOI: 10.1007/s12217-023-10076-7

Yuequn Tao, Qiusheng Liu, Jun Qin, Zhiqiang Zhu

{"title":"Thermocapillary Convection of Evaporating Thin Nanofluid Layer in a Rectangular Cavity","authors":"Yuequn Tao, Qiusheng Liu, Jun Qin, Zhiqiang Zhu","doi":"10.1007/s12217-023-10076-7","DOIUrl":"10.1007/s12217-023-10076-7","url":null,"abstract":"<div><p>Thermocapillary convection of nanofluid with evaporating phase change interface occurs in a variety of industrial processes such as micro/nano fabrication, ink-jet printing, thin film coatings, etc. Previous studies have mostly focused on the phenomena of thermocapillary convection in pure fluids without phase change. This paper reports the first fundamental experimental work on the thermocapillary flow of a thin nanofluid layer under the effect of evaporation. This research focuses on the behavior of a volatile thin nanofluid layer in a rectangular test cell under the effects of horizontal temperature gradient. The buoyancy effect can be neglected inside this thin liquid layer as in microgravity conditions. HEE7200 and HFE7200-Al<sub>2</sub>O<sub>3</sub> nanofluid are used as working fluids to analyze the effect of nanoparticle addition. The results indicate that the linear relationship between the thickness of the liquid layer and the duration of evaporation is not changed by nanoparticles. HFE7200-Al<sub>2</sub>O<sub>3</sub> nanofluid always has a higher evaporation rate than its base fluid with the temperature ranging from 2.98 °C to 13.92 °C. The critical Marangoni number for the nanofluid is lower than that of the pure fluid, which indicates that the addition of nanoparticles promotes the flow pattern transition.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0