Microgravity Science and Technology最新文献_第2页

Microgravity Control of a Free Surface in Elliptical Containers Via Thermocapillary Flows

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-02-07 DOI: 10.1007/s12217-025-10165-9

Ignacio Jiménez Blanco, Pablo Salgado Sánchez, Dan Gligor, Andriy Borshchak Kachalov, Ali Arshadi

{"title":"Microgravity Control of a Free Surface in Elliptical Containers Via Thermocapillary Flows","authors":"Ignacio Jiménez Blanco, Pablo Salgado Sánchez, Dan Gligor, Andriy Borshchak Kachalov, Ali Arshadi","doi":"10.1007/s12217-025-10165-9","DOIUrl":"10.1007/s12217-025-10165-9","url":null,"abstract":"<div><p>We present here an extensive analysis of the free surface dynamics driven by the thermocapillary effect in half-filled elliptical containers in microgravity. Depending on the cell ellipticity <span>(delta )</span>, which selects the preferred static equilibrium via surface energy, and on the applied thermal forcing <span>(Delta T)</span>, interesting dynamics are found. Simulations show that the steady, thermally-driven position of the interface — perpendicular to <span>(Delta T)</span> — undergoes a pitchfork bifurcation at a critical <span>(delta _textrm{cr})</span> that breaks the vertical reflection symmetry of the system. These results are supported by (leading order) estimates of the opposing thermocapillary and surface tension forces, predicting the linear dependence of <span>(delta _textrm{cr})</span> on <span>(Delta T)</span>. Finally, the free surface relaxation after switching off the thermal control is explored. As a whole, the present analysis indicates that one can combine thermocapillary flows and an adequate cell design to manipulate and control fluids in microgravity, with potential in a wide variety of applications.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-025-10165-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361760","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

Experiment on the Dynamics of a Thin Film Flow Coating on an Inclined Fiber

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-31 DOI: 10.1007/s12217-025-10161-z

Mingjie Guo, Zhiyi Liang, Xue Chen, Ruizhi Li, Rong Liu

引用次数: 0

Design and Modeling of a Self-Sensing Micro-Vibration Isolation System Utilizing a Lightweight Electret-Based Transducer for Space Applications

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-28 DOI: 10.1007/s12217-024-10157-1

Chao Dong, Zhaoshu Yang, Zhenkun Guo, Guoping Liu, Minzheng Sun

引用次数: 0

Determination of the Electric Field by Particle Tracking in a Plasma Sheath Region during Free Fall

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-23 DOI: 10.1007/s12217-025-10162-y

Andreas S. Schmitz, Luisa Hanstein, Max Klein, Michael Kretschmer, Christoph Lotz, Aleksandr Shemakhin, Markus H. Thoma

引用次数: 0

Evaluating Machine Learning as an Alternative to CFD for Heat Transfer Modeling 评估机器学习作为CFD传热建模的替代方案

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-21 DOI: 10.1007/s12217-025-10163-x

Seyed Hamed Godasiaei, Hossein Ali Kamali

{"title":"Evaluating Machine Learning as an Alternative to CFD for Heat Transfer Modeling","authors":"Seyed Hamed Godasiaei, Hossein Ali Kamali","doi":"10.1007/s12217-025-10163-x","DOIUrl":"10.1007/s12217-025-10163-x","url":null,"abstract":"<div><p>This study investigates the feasibility of replacing computational fluid dynamics (CFD) techniques with machine learning (ML) models for heat transfer modeling, focusing on forced convection processes. The research leverages artificial intelligence algorithms, specifically random forests (RF), super-gradient boosting (SGBoost), and artificial neural networks (ANN), to predict key heat transfer metrics such as Reynolds number, nanoparticle size, volume percentage, and Nusselt number. Using a dataset of 210 data points, the ML models are systematically applied to forecast heat transfer outcomes. Model performance is evaluated using Root Mean Squared Error (RMSE), Pearson’s correlation coefficient (r), and Mean Absolute Error (MAE). Results indicate that SGBoost achieves an accuracy of 91%, RF 90%, and ANN 86%, with corresponding RMSE values of 1.07, 1.65, and 16.1, respectively. These findings demonstrate that ML models not only deliver high accuracy and predictive power but also outperform traditional CFD methods in computational efficiency and adaptability to new data. Unlike conventional techniques that rely on predefined physical models and require extensive computational resources, ML approaches streamline the modeling process and enhance accessibility for diverse engineering applications. This study underscores the transformative potential of ML in advancing thermal analysis and optimizing forced convection heat transfer simulations.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995556","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

Investigation of the Droplet Impact Upon An Inclined Curved Non-Piezoelectric Substrate Propagating Lamb Waves 液滴对倾斜弯曲非压电基板传播兰姆波的冲击研究

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-10 DOI: 10.1007/s12217-024-10160-6

Zhaodong Yang, Zichen Wang, Zhijie Zhang, Yang Wang, Wei Liang

引用次数: 0

Experimental Study of Condensation Heat Transfer in Tubes under Centrifugal Force 离心力作用下管内冷凝换热实验研究

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-06 DOI: 10.1007/s12217-024-10159-z

Leigang Zhang, Meng Ru, Yonghai Zhang, Guopei Li, Zhenqian Chen, Gang Chen, Xuehong Wu

{"title":"Experimental Study of Condensation Heat Transfer in Tubes under Centrifugal Force","authors":"Leigang Zhang, Meng Ru, Yonghai Zhang, Guopei Li, Zhenqian Chen, Gang Chen, Xuehong Wu","doi":"10.1007/s12217-024-10159-z","DOIUrl":"10.1007/s12217-024-10159-z","url":null,"abstract":"<div><p>In this study, fluid flow during condensation in a tube under different gravity conditions is simulated by utilizing centrifugal force to offset gravitational effects. The role of fins, tube diameter, and steam quality on the two-phase flow pattern, temperature distribution, and pressure drop is investigated. The results show that gravity, tube diameter, and steam quality have a significant effect on the flow pattern. The flow characteristics were also significantly affected by the operating parameters, with undulating and laminar flow dominating, while bubbling flow emerges under specific conditions. In microgravity environments, as steam quality decreases, the temperature drop diminishes progressively compared to normal gravity conditions. Under normal gravity and low flow conditions, the average temperature of finned tubes increased by 7 °C to 16.4 °C relative to bare tube temperatures, and the pressure drop escalated by up to 56%. The introduction of fins notably enhanced heat transfer efficiency and facilitated a more uniform temperature distribution. However, this enhancement in heat transfer was accompanied by an increase in pressure drop due to the heightened resistance to fluid flow caused by the presence of fins. These experimental insights offer a deeper comprehension of fluid behavior under diverse gravity conditions and lay a scientific foundation for designing future thermal management systems.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938858","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

Recordings on PIEZO1-Overexpressing Oocytes in Microgravity 微重力下过表达piezo1的卵母细胞的记录

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-06 DOI: 10.1007/s12217-024-10155-3

Simon L. Wuest, Geraldine Cerretti, Jennifer Polzer, Simon Gerig, Christoph Zumbühl, Christian Jost, Lukas Rüfenacht, Robert Eberli, Barbara Krucker-Bösch, Julia Traversari, Melanie Horn, Daniel Invernot Pérez, Christina Giger-Lange, Karin F. Rattenbacher-Kiser, Fabian Ille, Gerhard Székely, Soeren S. Lienkamp, Marcel Egli

{"title":"Recordings on PIEZO1-Overexpressing Oocytes in Microgravity","authors":"Simon L. Wuest, Geraldine Cerretti, Jennifer Polzer, Simon Gerig, Christoph Zumbühl, Christian Jost, Lukas Rüfenacht, Robert Eberli, Barbara Krucker-Bösch, Julia Traversari, Melanie Horn, Daniel Invernot Pérez, Christina Giger-Lange, Karin F. Rattenbacher-Kiser, Fabian Ille, Gerhard Székely, Soeren S. Lienkamp, Marcel Egli","doi":"10.1007/s12217-024-10155-3","DOIUrl":"10.1007/s12217-024-10155-3","url":null,"abstract":"<div><p>Exposure to acute and prolonged microgravity triggers numerous physiological adaptations. To date, the underlying molecular mechanisms are not well understood, and several pathways have been proposed. Among other candidates, specific ion channels are hypothesized to be gravity dependent, but it has not been possible to conclusively demonstrate gravity dependency of specific protein entities. Therefore, we developed a miniaturized two-electrode voltage clamp (TEVC) that allowed electrophysiological experiments on <i>Xenopus laevis</i> oocytes using the GraviTower Bremen Prototype (GTB-Pro). The GTB-Pro is capable of flying experiments on a vertical parabolic trajectory, providing microgravity for a few seconds. As an interesting first candidate, we examined whether the nonselective mechanosensitive ion channel PIEZO1 is gravity dependent. The results showed no difference between PIEZO1-overexpressing and control oocytes under acute microgravity conditions.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-024-10155-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938859","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

Experimental Study on the Enhancement of Boiling Heat Transfer Performance Under the Condition of the Downward Heating Surface by an Electric Field 电场增强下向受热面沸腾传热性能的实验研究

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2024-12-24 DOI: 10.1007/s12217-024-10154-4

Xieyang Zhang, Jiayu Zuo, Qing Li, Bin Liu, Wangfang Du

{"title":"Experimental Study on the Enhancement of Boiling Heat Transfer Performance Under the Condition of the Downward Heating Surface by an Electric Field","authors":"Xieyang Zhang, Jiayu Zuo, Qing Li, Bin Liu, Wangfang Du","doi":"10.1007/s12217-024-10154-4","DOIUrl":"10.1007/s12217-024-10154-4","url":null,"abstract":"<div><p>This paper experimentally investigated the impact of the electric field strength (<i>E</i>), electrode installation heights (<i>H</i>), and the electrode shape on enhanced pool boiling heat transfer performance under a downward heating surface with an electric field. It is observed that the critical heat flux (CHF) generally increases with increasing electric field strength. For instance, for the mesh electrode, the CHF is increased by 100.0%, 240.0%, 340.0%, and 440.0% at <i>E</i> = 0.35 × 10<sup>6</sup> V/m, 0.70 × 10<sup>6</sup> V/m, 1.05 × 10<sup>6</sup> V/m, and 1.40 × 10<sup>6</sup> V/m, respectively, compared to <i>E</i> = 0 V/m. Furthermore, the electrodes hinder the detachment of vapor bubbles, which becomes more pronounced when the electrode installation height is low. At the same time, the more micro-ribs of the electrodes and the denser the distribution, the more uniform the electric field generated. Under this condition, the “pinch-off effect” caused by the non-uniform electric field is reduced, which is more conducive to enhancing boiling heat transfer performance. Ultimately, at <i>H</i> = 5.0 mm and <i>E</i> = 1.40 × 10<sup>6</sup> V/m, the CHF with grid electrodes improved by 101.1% compared with the horizontally upward without the electric field, which is a superior combination of working conditions and suggests that a more optimistic boiling heat transfer performance can be obtained in microgravity. This work provides guidance for enhancing boiling heat transfer in microgravity by an electric field.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875292","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

Control Strategy Optimization of Thermodynamic Venting System in Liquid Hydrogen Storage Tank Under Microgravity 微重力条件下液氢储罐热力排气系统控制策略优化

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2024-12-22 DOI: 10.1007/s12217-024-10156-2

Hui Chen, Xiaolong Li, Haomai Zhang, Peng Yang, Yingwen Liu, Wenlian Ye, Chunjie Yan, Xiaojun Wang

{"title":"Control Strategy Optimization of Thermodynamic Venting System in Liquid Hydrogen Storage Tank Under Microgravity","authors":"Hui Chen, Xiaolong Li, Haomai Zhang, Peng Yang, Yingwen Liu, Wenlian Ye, Chunjie Yan, Xiaojun Wang","doi":"10.1007/s12217-024-10156-2","DOIUrl":"10.1007/s12217-024-10156-2","url":null,"abstract":"<div><p>This study employed a lumped vapor model to investigate the depressurization dynamics during the thermodynamic venting process in a cryogenic liquid hydrogen storage tank under microgravity conditions. The effects of different control strategies-such as flow distribution, circulation flow rate, spray angle, and throttle valve switching time-on the performance of the thermodynamic venting system (TVS) were studied. Building on this foundation, the control strategies are refined across various filling rates and heat loads. The findings indicate that directing the flow towards the upper nozzle proximate to the vapor enhances the depressurization rate and augments the utilization of cooling capacity. The optimal circulation flow rate matches the heat entering the air pillow, and increases with higher heat load and lower filling rate. When the injection angle is 60°, the TVS achieves optimal performance with the fastest depressurization rate and no thermal stratification. The throttle valve opens during the early depressurization stage and closes when the pressure drops to the critical pressure <i>P</i><sub>cr</sub>, resulting in better performance. A lower filling rate and higher heat load lead to an increase in <i>P</i><sub>cr</sub>. This study provides a solid foundation for optimizing TVS control under various conditions, ultimately extending the storage duration of propellants in orbit.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870400","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