Microgravity Science and Technology最新文献_第10页

Investigation of the Dynamics of a Coating Flow on a Vertical Fiber Immersed in Surrounding Liquid Phase 垂直光纤在周围液相中的涂层流动动力学研究

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-08-01 DOI: 10.1007/s12217-023-10064-x

Yufeng Zhang, Rong Liu, Xue Chen

引用次数: 0

Beijing Drop Tower Microgravity Adjustment Towards 10–3 ~ 10−5g Level by Cold-Gas Thrusters 利用冷-气推力器对北京落塔进行10 - 3 ~ 10−5g微重力调整

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-07-25 DOI: 10.1007/s12217-023-10060-1

Chu Zhang, Chao Yang, L. Hu, Shuyang Chen, Yifan Zhao, L. Duan, Qi Kang

引用次数: 0

Beijing Drop Tower Microgravity Adjustment Towards 10–3 ~ 10−5g Level by Cold-Gas Thrusters 利用冷-气推力器对北京落塔进行10 - 3 ~ 10−5g微重力调整

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-07-25 DOI: 10.1007/s12217-023-10060-1

Chu Zhang, Chao Yang, Liang Hu, Shuyang Chen, Yifan Zhao, Li Duan, Qi Kang

{"title":"Beijing Drop Tower Microgravity Adjustment Towards 10–3 ~ 10−5g Level by Cold-Gas Thrusters","authors":"Chu Zhang, Chao Yang, Liang Hu, Shuyang Chen, Yifan Zhao, Li Duan, Qi Kang","doi":"10.1007/s12217-023-10060-1","DOIUrl":"10.1007/s12217-023-10060-1","url":null,"abstract":"<div><p>Drop tower is an important facility for conducting microgravity experiments on the ground. Since the Beijing drop tower was put into operation in 2003, a large number of scientific experiments have been carried out in the fields of microgravity fluid physics, combustion, materials science and fundamental physics. The drop tower has two operation modes: single capsule falling and double capsule falling, with the microgravity levels reaching 10<sup>−2</sup>g ~ 10<sup>−3</sup>g and 10<sup>−5</sup>g respectively. In order to meet the demand of multi-level microgravity levels in ground microgravity experiments, a double capsule microgravity level control system based on the cold-gas micro thruster is developed. The micro thrusters are mounted in the inner capsule of the double capsule system. During the fall of the double capsule, the cold-gas micro thrusters thrust in the opposite direction of the movement of the structure, which increases the resistance of the inner capsule to realize the control of microgravity level. The measurement results of the high-precision accelerometer show that the 10<sup>–3</sup> ~ 10<sup>−5</sup>g microgravity level can be controlled by this system.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117619969","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

Experimental Study of the Solid Motion in the Vicinity of the Wall in an Oscillating Cavity 振荡腔内壁面附近固体运动的实验研究

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-07-07 DOI: 10.1007/s12217-023-10062-z

O. A. Vlasova, V. G. Kozlov

{"title":"Experimental Study of the Solid Motion in the Vicinity of the Wall in an Oscillating Cavity","authors":"O. A. Vlasova, V. G. Kozlov","doi":"10.1007/s12217-023-10062-z","DOIUrl":"10.1007/s12217-023-10062-z","url":null,"abstract":"<div><p>The dynamics of spherical and cylindrical bodies in the vicinity of the cylindrical wall of the cavity filled with fluid under rotational oscillations is experimentally studied. We consider (i) the motion of a light spherical body inside a cylinder under rotational oscillations and (ii) the motion of the heavy cylindrical body in a horizontal cavity under modulated rotation. In the absence of the oscillations, the bodies are pressed against the cavity walls due to the action of (i) the buoyant force and (ii) the centrifugal force. The tangential and rotational body oscillations are studied by means of video registration. It is found that the body oscillations induce the averaged lift force that is responsible for the detachment of the body from the wall at the critical value of the amplitude of the body oscillations. The oscillation-induced repulsive force is measured by the method of the body suspension in a static field of (i) gravitational force or (ii) centrifugal force. It is found that the dimensionless lift force decreases with the distance from the wall according to the exponential law. The magnitude of the lift force is determined only by the amplitude of the velocity of the tangential body oscillation relative to the surrounding fluid while the intensity of the rotational body oscillations is of no importance. Also, the lift force does not depend on the distance to the wall and increases with the dimensionless frequency ω in the studied range ω = 10 – 90. The phenomenon of the oscillation-induced repulsion of the solid from the cavity wall is of interest for the development of an effective method for the control of multiphase media under microgravity conditions.\u0000</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4305243","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

Clarifying the Vital Role of Fluid Type in Diffusion through Complex Porous Media under Apparently Weak but Essentially Powerful Force of Gravity by Simulations Performed Using Image Processing Technique and D3Q27 Model of Lattice Boltzmann Method 利用图像处理技术和晶格玻尔兹曼法 D3Q27 模型进行模拟，阐明流体类型在表面微弱但本质强大的重力作用下通过复杂多孔介质进行扩散时的重要作用

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-07-05 DOI: 10.1007/s12217-023-10063-y

Hamid Zahedi, Mohammad Vakili

{"title":"Clarifying the Vital Role of Fluid Type in Diffusion through Complex Porous Media under Apparently Weak but Essentially Powerful Force of Gravity by Simulations Performed Using Image Processing Technique and D3Q27 Model of Lattice Boltzmann Method","authors":"Hamid Zahedi, Mohammad Vakili","doi":"10.1007/s12217-023-10063-y","DOIUrl":"10.1007/s12217-023-10063-y","url":null,"abstract":"<div><p>In this study, the vital role of fluid type in diffusion through a complex soil-like three-dimensional porous medium under gravity force was investigated by simulations performed using D3Q27 model of Lattice Boltzmann Method (LBM), with Double Relaxation Time (DRT) procedure as well as second-order discretization version of LBM. The elaborate porous medium was constructed using Image Processing technique by a detailed program written in MATLAB language. The hydrogen gas and water vapor were two fluids utilized in this project and because of small velocity of fluid, the Darcy law (with inclusion of gravity) was used extensively. Also, the satisfaction of continuity equation in different cross sections of porous medium was examined for both fluids; velocity and pressure contours were utilized also in this regard. The critical point of value of gravity acceleration <i>g</i> in LBM scale for different fluids was described and <i>g</i><sub><i>LBM</i></sub> was calculated for 13 fluids to emphasize the vital role of fluid type in LBM simulations. For being confident regarding the role of gravity, the value of gravity acceleration was set to zero intentionally (|<i>g</i>| =|<i>g</i><sub><i>LBM</i></sub>|= 0) in some other simulations. Because of complex nature of porous medium, the inclusion of Knudsen diffusion phenomenon in calculations of pressure change was necessary. After coupling of Darcy equation with Knudsen diffusion according to valid scientific resources, the calculation of permeability and mean pore diameter of porous medium was accomplished through special three-dimensional fitting by MATLAB. The interesting concept of Specific Surface Area (SSA) was introduced, too.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4216422","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

Dissipative Structures of Marangoni Convection in a Thin Layer of liquid with Lattice of Localized and Continuously Distributed Heat Sources and Sinks 具有局部连续分布热源和汇晶格的薄层液体中Marangoni对流的耗散结构

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-07-03 DOI: 10.1007/s12217-023-10061-0

Igor I. Wertgeim, Vadim A. Sharifulin, Albert N. Sharifulin

{"title":"Dissipative Structures of Marangoni Convection in a Thin Layer of liquid with Lattice of Localized and Continuously Distributed Heat Sources and Sinks","authors":"Igor I. Wertgeim, Vadim A. Sharifulin, Albert N. Sharifulin","doi":"10.1007/s12217-023-10061-0","DOIUrl":"10.1007/s12217-023-10061-0","url":null,"abstract":"<div><p>The three-dimensional solutions of nonlinear long-wavelength approximations for the problem of Marangoni convection in a thin horizontal layer of a viscous incompressible fluid with a free surface is being considered. The temperature distribution in the liquid corresponds to a uniform vertical gradient distorted by the imposition of a weakly inhomogeneous heat flux localized in the horizontal plane, caused by a lattice of either localized or continuously distributed heat sources and sinks. The lower boundary of the layer is solid and thermally insulated, while the upper one is free and deformable. The statement of the problem is motivated by the search for ways to control convection structures. The problem in long-wave approximation is described by a system of nonlinear transport equations for the amplitudes of temperature distribution and surface deformation. The numerical solution of the problem is based on the pseudospectral method. The dynamics of non-stationary dissipative structures is considered.\u0000</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-023-10061-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4471566","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

The Lunar One-Sixth Low Gravity Conduciveness to the Improvement of the Cold Resistance of Plants 月球六分之一低重力对植物抗寒性提高的影响

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-06-20 DOI: 10.1007/s12217-023-10058-9

Gengxin Xie, Jing Yang, Yuxuan Xu, Yuanxun Zhang, Dan Qiu, Jinghang Ding

{"title":"The Lunar One-Sixth Low Gravity Conduciveness to the Improvement of the Cold Resistance of Plants","authors":"Gengxin Xie, Jing Yang, Yuxuan Xu, Yuanxun Zhang, Dan Qiu, Jinghang Ding","doi":"10.1007/s12217-023-10058-9","DOIUrl":"10.1007/s12217-023-10058-9","url":null,"abstract":"<div><p>For humanity to complete its ambitious solar system exploration, it is crucial to comprehend how terrestrial life reacts to differing planet gravity. We followed the life trajectory of an earth cotton seed's germination, development, and ultimate fate after prolonged exposure to extremely low temperatures using the life-regeneration ecosystem carried by Chang'e 4 probe, which landed on the Moon on January 3rd, 2019, for the first time in human history. In a controlled environment with similar characteristics, such as temperature, humidity, air pressure, and nutrition, we compared this life trajectory on the moon to that on Earth, except for the differences in gravity, light, and radiation. We discovered that the 1/6 g moon gravity speeds up seed germination. Surprisingly, Moon seed-lings demonstrated rapid acclimatization to super-freezing (below minus 52 degrees Celsius) under 1/6 g lunar gravity, maintaining upright and green despite exposure to long-term extremely cold temperatures for 18–24 hours. Based on cellular and molecular reactions caused by moon-low gravity, we suggest probable mechanisms for cold resilience. These unique findings will enhance our understanding of how plants adapt to suboptimal environmental conditions in space.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-023-10058-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4795027","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: 1

Experimental Study On Gravity-effect for Startup Performance of High-Temperature Sodium Heat Pipe 重力对高温钠热管启动性能影响的实验研究

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-06-17 DOI: 10.1007/s12217-023-10056-x

Zhi Hu XUE, Bang Cheng AI, Wei QU

{"title":"Experimental Study On Gravity-effect for Startup Performance of High-Temperature Sodium Heat Pipe","authors":"Zhi Hu XUE, Bang Cheng AI, Wei QU","doi":"10.1007/s12217-023-10056-x","DOIUrl":"10.1007/s12217-023-10056-x","url":null,"abstract":"<div><p>The gravity-effect plays important factor on the startup and thermal performance of high-temperature heat pipes (HTHPs). But the results of past studies are quite different and confusing our perception. In this paper, a sodium HTHP is fabricated and experimented to study the gravity-assisted, horizontal and anti-gravity three modes on the startup behaviors and quasi-steady thermal performance. The HTHP is designed to Φ25 × 410 mm, two wraps of 100 mesh screen, and filling mass of 15 g sodium. The HTHP is tested at the inclination angle of 0°, 90°, -30° and -90°. The results show that no startup failures are found during all the three operating modes and the startup time for HTHP fully starting at different inclination angle is the same as 10 min. However, the gravity-effect cannot be ignored and plays important influence on the HTHP startup. Compared with the horizontal mode, the gravity-assisted mode (90°) is beneficial for the starting more favorably and decreasing the temperature difference between the evaporator and condenser after the startup. The anti-gravity working mode has a significant adverse effect on the temperature rise-rate of the HTHP condenser and increase the temperature difference after the startup in a large step as the inclination angle changed from 0°, -30° to -90°.\u0000</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-023-10056-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4690093","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

Development of an Approach to Measure the Inner Wall Temperature of a Tubular Window for Experiments of Two-Phase Flow Heat Transfer on the China Space Station 中国空间站两相流换热实验管状窗内壁温度测量方法的研究

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-06-13 DOI: 10.1007/s12217-023-10059-8

Zhengxi Dong, Zhenrui Wang, Liping Huang, Yukuan Shen, Zhenhui He

{"title":"Development of an Approach to Measure the Inner Wall Temperature of a Tubular Window for Experiments of Two-Phase Flow Heat Transfer on the China Space Station","authors":"Zhengxi Dong, Zhenrui Wang, Liping Huang, Yukuan Shen, Zhenhui He","doi":"10.1007/s12217-023-10059-8","DOIUrl":"10.1007/s12217-023-10059-8","url":null,"abstract":"<div><p>Observation of vapor-liquid two-phase flow patterns in a tube, together with precision measurement of the inner wall temperature of the tube is a key technique for studying the heat transfer of phase change of the two-phase flow. For the experimental study of the in-tube two-phase flow and phase-change heat transfer in microgravity on the China Space Station (CSS), a platinum thin film about 40 nm in thickness is coated on the inner wall of a quartz tube, allowing for observing flow patterns of the fluid, heating the fluid passing through, and measuring the temperature of the platinum film itself. To verify that the platinum film can measure the temperature of itself while it is working as a heater simultaneously, experiment was conducted on a selected tubular window. It showed quite acceptable precision and repeatability of the temperature measurement (0.1 ℃) at a current density of less than 4kA/cm<sup>2</sup> for calibration and remained 0.2 ℃ for applied current up to 0.7A (70kA/cm<sup>2</sup>) when it worked as a heater. After the current of 0.7A was applied for about 6 h, the slope and intercept of the linear temperature-resistance relationship of the platinum film change (i.e., the room-temperature resistance increases by 2Ω). Such platinum film can be served as a thermometer after a second in-situ calibration, with a precision kept within 0.1 ℃.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-023-10059-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4541911","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

Inertial Wave Beam Path in a Non-uniformly Rotating Cylinder with Sloping Ends 端部倾斜非均匀旋转圆柱体中的惯性波束路径

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-06-01 DOI: 10.1007/s12217-023-10054-z

Stanislav Subbotin, Mariya Shiryaeva

{"title":"Inertial Wave Beam Path in a Non-uniformly Rotating Cylinder with Sloping Ends","authors":"Stanislav Subbotin, Mariya Shiryaeva","doi":"10.1007/s12217-023-10054-z","DOIUrl":"10.1007/s12217-023-10054-z","url":null,"abstract":"<div><p>The features of the inertial wave beam propagation in a librating cylindrical cavity with symmetrically inclined end-walls are experimentally studied. The geometry provides the existence of two flow regimes – inertial wave attractor and the case of symmetric beam reflection that is like the closed periodic orbit in a rotating spherical shell. Despite the visual similarity, the nature of the regimes is different. The first is due to the geometric focusing of the beams into the limit cycle after a series of reflections from sloping ends, and the second with the symmetry wave path for a given frequency and cavity geometry. Although the geometry of the problem is three-dimensional, these regimes are almost two-dimensional: the closed wave trajectory is trapping near the plane of the direction of the slope gradient of the ends. Also, we study the scaling laws for the width and amplitude of the oscillating shear layers in the axial section. At large amplitudes of the librational forcing, the global azimuthal vorticity grows in a quadratic manner, which indicates the development of a nonlinear regime of inertial waves. Fourier analysis shows that a spectrum, besides the fundamental frequency, contains two sets of closely spaced subharmonic frequencies that satisfy the triadic resonance condition.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"35 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4037514","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