Microgravity Science and Technology最新文献_第9页

Numerical Study of Temperature and Flow Field Characteristics of CdTe Crystal Growth in Low Gravity Field 低重力场中碲化镉晶体生长温度和流场特性的数值研究

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-11-06 DOI: 10.1007/s12217-025-10202-7

Weiyi He, Xuechao Liu, Hengduo Wu, Shengnan Jiang, Weijie Deng, Kun Chen, Meibo Tang, Xiuhong Pan, Min Jin

{"title":"Numerical Study of Temperature and Flow Field Characteristics of CdTe Crystal Growth in Low Gravity Field","authors":"Weiyi He, Xuechao Liu, Hengduo Wu, Shengnan Jiang, Weijie Deng, Kun Chen, Meibo Tang, Xiuhong Pan, Min Jin","doi":"10.1007/s12217-025-10202-7","DOIUrl":"10.1007/s12217-025-10202-7","url":null,"abstract":"<div><p>In a low-gravity (g/6) environment, the high flow rate is maintained while buoyant convection is somewhat suppressed compared to conditions in terrestrial gravity (1g) and microgravity (10<sup>−4</sup>g), potentially promoting crystal growth via the melt method. To investigate the heat transfer mechanisms and the crystal growth/solidification process of CdTe crystals grown using the Vertical Bridgman (VB) method in g/6 conditions, two-dimensional axisymmetric numerical simulations were performed based on COMSOL simulation software. Comparison of the simulation results for temperature and flow fields in 1g, g/6, and 10<sup>−4</sup>g environments reveals that, the melt flow penetrates a low-temperature melt layer at g/6, resulting in a density-layer penetration effect that mitigates heat accumulation and reduces the streamline bending observed in 1g conditions. However, at g/6, a relative flow also forms above the solid–liquid interface, leading to the greatest interface bending and the steepest temperature gradient among the three gravitational conditions. This phenomenon may promote the accumulation of impurities and defects while simultaneously stabilizing the solid–liquid interface. Finally, a dimensionless parameter is introduced to elucidate the simulation phenomena and confirm the accuracy of the simulations.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 6","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145456652","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

Parametric Excitation of Marangoni Oscillations in a Two-layer Film by Heating Modulation 加热调制下两层膜中Marangoni振荡的参量激发

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-11-03 DOI: 10.1007/s12217-025-10216-1

Grigoriy Khilko, Alexander Nepomnyashchy

引用次数: 0

The Influence of Substrate Surface Heterogeneity on the Oscillations of a Sessile Bubble 衬底表面非均匀性对无孔气泡振荡的影响

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-10-27 DOI: 10.1007/s12217-025-10217-0

Aleksey A. Alabuzhev

{"title":"The Influence of Substrate Surface Heterogeneity on the Oscillations of a Sessile Bubble","authors":"Aleksey A. Alabuzhev","doi":"10.1007/s12217-025-10217-0","DOIUrl":"10.1007/s12217-025-10217-0","url":null,"abstract":"<div><p>Free and forced oscillations of a hemispherical gas bubble on a rigid parallel plate surrounded by an incompressible liquid layer with a free surface in a uniform pulsating pressure field are considered. A model is proposed for describing the substrate surface heterogeneity through the wetting parameter (Hocking parameter), which is a proportionality coefficient between the contact line velocity and the contact angle deviation. The surface heterogeneity is important only near the contact line due to small-amplitude oscillations, which allows considering the form of surface heterogeneity as a function of one spatial variable. An external action excites only axisymmetric oscillations, shape oscillations arise due to the contact line movement along the substrate surface, but azimuthal modes are also excited by heterogeneity and their spectrum depends on the plate heterogeneity. In addition, the frequency of volume oscillations depends on the gas pressure in the bubble, so that this frequency can be equal to the frequency of bubble shape oscillations of any mode. The problem is solved using a Fourier series expansion in basis functions. The resulting system of amplitude equations is solved numerically due to its cumbersome nature.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 6","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145405855","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

Assessment of the Equivalent Low-Gravity of the Granular Collapse Equipment in the VGR of the Chinese Space Station 中国空间站VGR中颗粒坍缩设备等效低重力评估

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-10-23 DOI: 10.1007/s12217-025-10213-4

Sen Yang, Xiaohui Cheng, Meiying Hou, Lichao Yu

{"title":"Assessment of the Equivalent Low-Gravity of the Granular Collapse Equipment in the VGR of the Chinese Space Station","authors":"Sen Yang, Xiaohui Cheng, Meiying Hou, Lichao Yu","doi":"10.1007/s12217-025-10213-4","DOIUrl":"10.1007/s12217-025-10213-4","url":null,"abstract":"<div><p>Aboard the variable-gravity research rack (VGR) of the Chinese Space Station, scientists can conduct experiments under reduced gravities in a centrifuge. This study analyzes the spatial distribution effects of centrifugal gravitational fields and Coriolis force effects in the granular collapse experiments conducted in the centrifuge. Under the ground-based 1 g and space equivalent 1 g conditions, we have investigated the influences of centrifugal equivalent gravitational fields on the granular collapsed deposition shape. The granular column collapse has formed a complex deposition shape with the middle section slope angle close to the angle of repulse of the granular material. Both the horizontal centrifuge acceleration component and the Coriolis force in the space centrifuge has significantly changed the deposition height and upper-section slope angles compared to the benchmark experiment conducted on the ground. Numerical simulations were further performed for equivalent gravity levels of 1/6 g and 1/3 g, revealing that under the prediction of the rate-independent constitutive model used, the final collapse morphologies are independent of gravity levels, and the influence of the centrifuge gravity field is also unrelated to the gravity level magnitude.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 6","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145352421","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

Evaluation of the Intraocular Pressure Following Helicopter Flight 直升机飞行后眼压的评估

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-10-20 DOI: 10.1007/s12217-025-10215-2

Şükrü Hakan Gündüz, Tomurcuk Harbigil Sever, İffet Yarımağa, Onur Tezel

{"title":"Evaluation of the Intraocular Pressure Following Helicopter Flight","authors":"Şükrü Hakan Gündüz, Tomurcuk Harbigil Sever, İffet Yarımağa, Onur Tezel","doi":"10.1007/s12217-025-10215-2","DOIUrl":"10.1007/s12217-025-10215-2","url":null,"abstract":"<div><p>Exposure to high-altitude conditions during flight or other similar activities has a wide-ranging impact on visual function, which is crucial not just for flight safety but for any altitude-related activity. We aimed to look at the impact of high altitude on the intraocular pressure (IOP) of helicopter pilots. The flight took off from the airstrip at 5,525 feet and flew for an hour every day for 10 days at 8,000 feet. above mean sea level. Flights were undertaken at an altitude of 12,000 feet above mean sea level over the next 10 days. During these days, pilots had no other flights. Each pilot’s one eye was measured with a Tonopen (Reichert Tono-Pen AVIA) after five topical anesthetic drops prior to flight. The arithmetic mean of five measurements was determined and recorded as a value. The pre- and post-flight data for each subgroup were analyzed using the paired sample T-test in SPSS version 20 software. For the flights at an altitude of 8,000 feet, no group showed a significant change in IOP. For the flights at an altitude of 12,000 feet, both groups showed statistically significant changes in IOP. IOP decrease may contribute to an increased risk of safety events following prolonged flights at high altitudes in helicopter pilots.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 6","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145316567","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

Fluidic Shaping and Pressure-based Precision Control of Optical Lenses 光学透镜的流体成形与压力精密控制

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-10-16 DOI: 10.1007/s12217-025-10207-2

Hanyang Li, Chen Zhao, Hao Chen, Kaiwen Wang, Ding Lan

引用次数: 0

Thermal Performance Comparative Study of Orthogonally and Axially Grooved Heat Pipes Under Different Gravity and Heat Sink Temperature Operating Conditions 不同重力和散热器温度工况下正交与轴向开槽热管热性能对比研究

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-10-13 DOI: 10.1007/s12217-025-10205-4

Samah Maalej, Imène Saâd, Jed Mansouri, Mohamed Chaker Zaghdoudi

{"title":"Thermal Performance Comparative Study of Orthogonally and Axially Grooved Heat Pipes Under Different Gravity and Heat Sink Temperature Operating Conditions","authors":"Samah Maalej, Imène Saâd, Jed Mansouri, Mohamed Chaker Zaghdoudi","doi":"10.1007/s12217-025-10205-4","DOIUrl":"10.1007/s12217-025-10205-4","url":null,"abstract":"<div><p>This study deals with the thermal performance of a flat copper heat pipe with a capillary structure composed of orthogonal grooves filled with water, so-called flat orthogonally grooved heat pipe. The orthogonal grooves are created using a CNC machine and filled using an automated filling apparatus. Under optimal operating conditions (thermosyphon position and cold source temperature of 40 °C), experimental results show that flat orthogonally grooved heat pipes effective thermal conductivity is approximately three times that of copper. Similarly, it is found that the flat orthogonally grooved heat pipe has lower thermal resistance than the flat axially grooved heat pipe studied in a previous work. Furthermore, a heat transfer analysis demonstrates that flat axially grooved heat pipe outperforms the flat orthogonally grooved heat pipe by up to 50% in evaporation, whereas the flat orthogonally grooved heat pipe performs up to 35% better than the flat axially grooved heat pipe in condensation. Based on a dimensionless analysis, heat transfer correlations for evaporation and condensation are proposed. The gap between evaporation and condensation heat transfer coefficients calculated by the correlations and those determined experimentally varies between ± 10% and ± 20%. Finally, a model based on energy conservation equations is proposed to predict the temperature distribution along the flat orthogonally grooved heat pipe. The distributions in wall temperature obtained from the model are consistent with experimental measurements.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 5","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145315819","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

Liquid-Vapor Interface Configuration Calculation for On-Orbit Propellant Management in Microgravity 微重力在轨推进剂管理的液-气界面构型计算

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-10-13 DOI: 10.1007/s12217-025-10210-7

Zhaozhen Guo, Yulong Yan, Mingle Deng

{"title":"Liquid-Vapor Interface Configuration Calculation for On-Orbit Propellant Management in Microgravity","authors":"Zhaozhen Guo, Yulong Yan, Mingle Deng","doi":"10.1007/s12217-025-10210-7","DOIUrl":"10.1007/s12217-025-10210-7","url":null,"abstract":"<div>\u0000 \u0000 <p>Accurate prediction of liquid-vapor interface configurations is mission-critical for autonomous on-orbit propellant management, particularly during microgravity refueling operations where precise fluid control dictates mission success. In such environments, the systematic and rigorous evaluation of hydrostatic interfaces plays a vital role in ensuring optimal performance during liquid management and spacecraft attitude control. These fluid interfaces are primarily governed by residual gravitational effects, contact angles, and the geometric configurations of the containers. This paper investigates the characteristics of liquid-vapor interfaces within axisymmetric containers through a combination of theoretical analysis and numerical simulations. The dimensionless governing equations for hydrostatic surfaces in spherical coordinates are derived theoretically, based on the variational principle and the virtual work principle. A novel algorithm has been developed to compute liquid-vapor interface configurations in axisymmetric containers including ellipsoidal and Cassini tanks. The algorithm is validated by theoretical analysis and comparisons of numerical simulations and experimental data. Meanwhile, the impacts of various parameters on the liquid-vapor interface configurations are further analyzed in detail. Notably, the proposed method demonstrates significantly enhanced computational efficiency compared to conventional approaches. Furthermore, the algorithm can adaptively adjust its input parameters to predict hydrostatic interfaces under varying conditions. This methodology establishes a reliable foundation for real-time analysis of sloshing dynamics and liquid reorientation, thereby enabling autonomous decision-making during critical on-orbit refueling servicing phases.</p>\u0000 </div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 5","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145315898","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

Electrothermoconvective Oscillatory Flows of a Low Conducting Liquid in Alternating Electric Field 交变电场中低导电性液体的电热对流振荡流动

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-10-13 DOI: 10.1007/s12217-025-10212-5

Oleg O. Nekrasov, Boris L. Smorodin

引用次数: 0

Heat Transfer Enhancement in Air by Means of Acoustics in Microgravity Conditions 微重力条件下声学增强空气传热的研究

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-10-07 DOI: 10.1007/s12217-025-10203-6

Alex Drago-González, Ioana El Kraye Ziade, Yago Ferreiro, Ricard González-Cinca

{"title":"Heat Transfer Enhancement in Air by Means of Acoustics in Microgravity Conditions","authors":"Alex Drago-González, Ioana El Kraye Ziade, Yago Ferreiro, Ricard González-Cinca","doi":"10.1007/s12217-025-10203-6","DOIUrl":"10.1007/s12217-025-10203-6","url":null,"abstract":"<div><p>On Earth, electronic circuits dissipate heat through convective flows driven by gravity, transferring energy from devices to the environment. In microgravity, the absence of buoyancy disrupts this mechanism, causing heat accumulation and potential damage. Here, we present an experimental study on enhancing heat transfer in air in microgravity via acoustic actuation. The setup consists of a test cell and subsystems for heat generation, acoustic actuation, and data acquisition. Experiments were conducted in five drops at the ZARM Drop Tower in Bremen (Germany), each providing 9.3 seconds of microgravity. Thermocouple data and high-speed videos were recorded per drop. We analyzed temperature evolution at different positions from the heat source and heat distribution inside the test cell using the Background Oriented Schlieren technique. Qualitative and quantitative results show that acoustic actuation distributes heat over larger regions, strengthening with increased pressure amplitude. Temperature increased when actuated at resonance frequency, with heat transfer along the actuation direction increasing at a rate of 0.44 K/s. Results confirm that acoustic actuation improves heat transfer in microgravity, likely due to convection-like flows induced by acoustic streaming. This study provides a foundation for new cooling techniques applicable to satellites and spacecraft.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 5","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-025-10203-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145256244","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