Microgravity Science and Technology最新文献_第2页

Minimization of Coriolis Effect on Heat Transfer Over a Partially Heated Wall in a Rotating Enclosure 旋转机壳部分加热壁面传热的科氏效应最小化

IF 1.5 4区工程技术

Microgravity Science and Technology Pub Date : 2026-09-17 DOI: 10.1007/s12217-026-10286-9

Chengyao Li, James S. T’ien

{"title":"Minimization of Coriolis Effect on Heat Transfer Over a Partially Heated Wall in a Rotating Enclosure","authors":"Chengyao Li, James S. T’ien","doi":"10.1007/s12217-026-10286-9","DOIUrl":"10.1007/s12217-026-10286-9","url":null,"abstract":"<div><p>To study heat transfer and combustion in reduced gravity environments, such as those on the Moon or Mars, a centrifuge becomes a useful tool. However, the artificial gravity generated in a rotating platform is complicated by the presence of the Coriolis force. The effect of this extra force needs to be minimized to accurately simulate natural gravity. In this work, two- and three-dimensional transient numerical computations are performed to quantify the effect of the Coriolis force. Differences between Lunar gravity and artificial gravity on buoyant flow and convective heat transfer are discussed. This study shows there are configurations that can minimize the Coriolis force effects on flow and heat transfer profiles. Ideally, when the artificial gravity vector is parallel to the heating wall, and the flow and heat transfer profile can be configured two-dimensional with a wide heating surface, orienting the rotation axis parallel to the third (width) dimension renders the Coriolis force irrotational and its effect negligible. When the configuration is essentially three-dimensional, orienting the dominant Coriolis force component toward the heated solid surface can significantly reduce the Coriolis effect, compared with orienting it away from the surface.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-026-10286-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986594","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

Convective-Roll Instabilities of a Horizontal Porous Layer Saturated by a Power-Law Fluid with Variable Gravity 变重力幂律流体饱和水平多孔层的对流-滚转不稳定性

IF 1.5 4区工程技术

Microgravity Science and Technology Pub Date : 2026-09-15 DOI: 10.1007/s12217-026-10284-x

Ambica Kolipaka, Anjanna Matta

引用次数: 0

Electrothermal Convection of the Low Conducting Liquid in a Flat Horizontal Capacitor 低导电性液体在扁平水平电容器中的电热对流

IF 1.5 4区工程技术

Microgravity Science and Technology Pub Date : 2026-09-12 DOI: 10.1007/s12217-026-10285-w

Oleg O. Nekrasov, Boris L. Smorodin

引用次数: 0

Assessing Water Dynamics at Lunar Gravity 评估月球重力下的水动力学

IF 1.5 4区工程技术

Microgravity Science and Technology Pub Date : 2026-09-12 DOI: 10.1007/s12217-026-10277-w

Karl H. Hasenstein, John Z. Kiss, Christopher P. McKay

引用次数: 0

The Mass Transfer of Different Molecules in the Bone Lacunar-Canalicular System Under Normal and Hypergravity Fields 正常和超重力场作用下骨腔管系统中不同分子的传质

IF 1.5 4区工程技术

Microgravity Science and Technology Pub Date : 2026-09-11 DOI: 10.1007/s12217-026-10281-0

Yipeng Yue, Baochuan Xiong, Tianyu Liu, Chunqiu Zhang, Shuhong Liu, Lilan Gao, Nian Liu, Xuejin Li

{"title":"The Mass Transfer of Different Molecules in the Bone Lacunar-Canalicular System Under Normal and Hypergravity Fields","authors":"Yipeng Yue, Baochuan Xiong, Tianyu Liu, Chunqiu Zhang, Shuhong Liu, Lilan Gao, Nian Liu, Xuejin Li","doi":"10.1007/s12217-026-10281-0","DOIUrl":"10.1007/s12217-026-10281-0","url":null,"abstract":"<div><p>The <i>Lacunar-Canalicular System (LCS)</i> is a complex micrometer-scale structure that ensures an adequate supply of nutrients and the removal of metabolic waste products. The unique transport characteristics of the LCS may provide insights into the underlying mechanisms of osteoporosis in both astronauts during spaceflight and aged individuals. This study focused on the transport behaviors of three tracers with molecular weights of 376 Da, 20 kDa, and 150 kDa in bone LCS. Fluorescence intensity at osteocyte lacunae was adopted to evaluate the transport performance of three tracers under normogravity and hypergravity. The experimental results demonstrated that the lacunae fluorescence intensity is inversely proportional to the distance from the Haversian canal. When comparing the mass transfer of different molecules, small molecular tracers exhibited higher transfer rates, while large molecular tracers showed lower transfer rates. Under hypergravity conditions, fluorescence intensity within deep-layer lacunae rose significantly for all tracers. The most significant change was observed in the large molecular tracers, with fluorescence intensities in the superficial, shallow, middle, and deep layers elevated by 211.1%, 214.2%, 275.0%, and 350.0%, respectively, indicating that hypergravity promotes LCS mass transfer. Furthermore, extending the transfer time has been proven to promote the transfer of large molecular tracers to deeper lacunae. Conversely, the fitted curve of fluorescence intensity under different gravity fields suggests that microgravity may inhibit mass transfer in the LCS, leading to bone loss and ultimately osteoporosis. This study provides novel insights into mass transfer patterns within the LCS and proposes potential therapeutic strategies for osteoporosis.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927338","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 High-dimensional System-level Calibration of Platform Inertial Navigation Systems on a Dual-axis Centrifuge 双轴离心机平台惯性导航系统的高维系统级标定研究

IF 1.5 4区工程技术

Microgravity Science and Technology Pub Date : 2026-09-09 DOI: 10.1007/s12217-026-10272-1

Tianyi Xie, Shunqing Ren, Huanzhen Liu, Chuankun Han, Zongkang Wei

{"title":"Research on High-dimensional System-level Calibration of Platform Inertial Navigation Systems on a Dual-axis Centrifuge","authors":"Tianyi Xie, Shunqing Ren, Huanzhen Liu, Chuankun Han, Zongkang Wei","doi":"10.1007/s12217-026-10272-1","DOIUrl":"10.1007/s12217-026-10272-1","url":null,"abstract":"<div><p>To eliminate the influence of centrifuge errors on the calibration accuracy of the platform inertial navigation systems, a high-dimensional system-level calibration method is designed. By combining the error propagation chain of the dual-axis centrifuge with the accelerometer error model, the indicated output of the accelerometer is obtained, and the indicated output-input error model is established, which serves as the basis for high-dimensional filtering. The established model incorporates the accelerometer error model, the accelerometer installation misalignment angles, the centrifuge equipment installation errors, and the platform inertial navigation system installation errors. A 35-dimensional state vector containing these errors is established, with the outputs of three accelerometers taken as observables. Subsequently, the state equation and the observation equation are derived, and a Kalman filter is designed for identifying the state vector. A 20-position rotation scheme through rotating frames of the platform inertial navigation system is designed, which takes advantage of the high-g environment (high-overload environment) provided by the centrifuge to fully excite all error model coefficients of the accelerometer, while eliminating the influence of centrifuge errors on the calibration of the accelerometer assembly. All error model coefficients of the accelerometer converged to the vicinity of the true values with high estimation accuracy.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148926825","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

Linear Stability Analysis of Inclined Double-Diffusive Hadley Flow in a Porous Bed: Effects of Horizontal Forcing, Peclet and Gebhart Numbers 多孔床中斜向双扩散Hadley流的线性稳定性分析：水平强迫、Peclet数和Gebhart数的影响

IF 1.5 4区工程技术

Microgravity Science and Technology Pub Date : 2026-09-07 DOI: 10.1007/s12217-026-10280-1

Chapala Uma, Nagaraju Gajjela, Anjanna Matta, Muhammed Rafeek KV

{"title":"Linear Stability Analysis of Inclined Double-Diffusive Hadley Flow in a Porous Bed: Effects of Horizontal Forcing, Peclet and Gebhart Numbers","authors":"Chapala Uma, Nagaraju Gajjela, Anjanna Matta, Muhammed Rafeek KV","doi":"10.1007/s12217-026-10280-1","DOIUrl":"10.1007/s12217-026-10280-1","url":null,"abstract":"<div><p>This study investigates the linear instability of double-diffusive Hadley convection in a horizontal porous bed. Here, the flow is caused by the combined effects of inclined temperature and concentration gradients under constant gravity. The main flow has a straight velocity profile and steady mass flow, which is typical for Hadley-type circulation. The analysis of instability takes viscous heating into account. The system is described using six dimensionless parameters: horizontal and vertical thermal Rayleigh numbers (for heat input and output), temperature and concentration differences between the top and bottom surfaces, the Péclet number (which measures the base horizontal flow velocity), and the Gebhart number (which shows heat loss from viscous heating). For given values of the horizontal Rayleigh, Péclet, and Gebhart numbers, the study finds the critical vertical Rayleigh number and the related critical wave number. Numerical techniques such as the combined shooting method with Runge-Kutta integration are employed to analyze the system’s linear instability. The results identify the crucial parameters that cause instability in the Hadley flow and emphasise the major contribution of non-uniform, inclined gradients to lowering the convection thresholds.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148926919","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 and Numerical Analysis of In-Orbit Launch Dynamics of Micro-Spacecraft Based on Solid Thruster 基于固体推进器的微型航天器在轨发射动力学实验与数值分析

IF 1.5 4区工程技术

Microgravity Science and Technology Pub Date : 2026-09-05 DOI: 10.1007/s12217-026-10282-z

Zengqiao Tan, Haibo Yang, Xiaoyu Tao, Wenhe Liao

{"title":"Experimental and Numerical Analysis of In-Orbit Launch Dynamics of Micro-Spacecraft Based on Solid Thruster","authors":"Zengqiao Tan, Haibo Yang, Xiaoyu Tao, Wenhe Liao","doi":"10.1007/s12217-026-10282-z","DOIUrl":"10.1007/s12217-026-10282-z","url":null,"abstract":"<div><p>Deorbiter systems based on micro-spacecraft presents a promising approach for the active removal of space debris. Stable in-orbit deployment is a prerequisite for the successful completion of the entire mission. To investigate the reliability and launch dynamics of in-orbit launch systems for micro-spacecraft, this study developed a ground-based test system using the drop-tower method and employed a high-precision measurement system to capture the dynamic response of the micro-spacecraft during launch. A numerical model of the micro-spacecraft’s in-orbit launch dynamics was developed employing multi-body dynamics. This model accounts for thrust eccentricity, motion coupling between the micro-spacecraft and the satellite platform, contact collisions during launch, and other perturbation factors. The accuracy of the numerical model was validated by comparing the simulation results with those from ground tests. Based on this, Monte Carlo simulations were conducted to analyze and discuss the factors influencing the separation angular velocity of the micro-spacecraft. The results indicate that, for specific structural and parameter configurations, controlling the eccentricity angle of the solid-propellant thruster and the clearance between the micro-spacecraft and the separation mechanism within certain limits can effectively reduce the micro-spacecraft’s separation angular velocity.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148926892","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

Observability-Limited Dual-Pilot-Tone Monitoring of Electrostatic Actuation: AC-Carrier Model and Reproducible Numerical Assessment 静电驱动的可观测性有限双导频监测：交流载波模型和可重复的数值评估

IF 1.5 4区工程技术

Microgravity Science and Technology Pub Date : 2026-08-29 DOI: 10.1007/s12217-026-10273-0

Yanlin Sui, Shang Wang

{"title":"Observability-Limited Dual-Pilot-Tone Monitoring of Electrostatic Actuation: AC-Carrier Model and Reproducible Numerical Assessment","authors":"Yanlin Sui, Shang Wang","doi":"10.1007/s12217-026-10273-0","DOIUrl":"10.1007/s12217-026-10273-0","url":null,"abstract":"<div><p>Slow fluctuations of electrostatic actuation gain couple commanded forces into the low-frequency acceleration observable of a space inertial sensor. This paper develops dual-pilot-tone (DPT) monitoring for the audio-frequency carrier actuation architecture of LISA Pathfinder-class gravitational reference sensors and establishes its observability limits. After carrier-period averaging, each low-frequency pilot modulates the squared carrier amplitude, and a drive-side observation contains a projected product of actuator, test-mass, controller, and readout responses. Two tones add a consistency test for frequency-selective anomalies but cannot separate common actuation drift from common sensing-chain drift or identify which tone is faulty after a mismatch. Metrological actuation calibration therefore requires an independent readout reference or a quantified sensing-stability bound. Across 24 stochastic seeds, the median residual-gain ASD over 0.001–0.1 Hz changes from 7.69 [7.55, 7.80] ppm/√Hz without compensation to 1.88 [1.85, 1.89] ppm/√Hz with a stable readout under the full-amplitude two-tone configuration, while readout drift gives 9.23 [9.10, 9.35] ppm/√Hz and a simulated independent monitor restores 2.07 [2.05, 2.09] ppm/√Hz. A matched total-injection comparison shows that single- and dual-tone nominal noise performance is similar; the practical value of the second tone is anomaly detection and guarded bypass rather than an intrinsic signal-to-noise advantage. The evidence is analytical and numerical, and hardware validation remains future work.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148838302","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

Magnetic Nanofluid Film Boiling Over a Flat Plate at Various Gravity Levels in the Presence of Non-Uniform Magnetic Field Generated by a Current-Carrying Wire 在载流导线产生的非均匀磁场存在下，磁性纳米流体膜在不同重力水平下在平板上沸腾

IF 1.5 4区工程技术

Microgravity Science and Technology Pub Date : 2026-08-27 DOI: 10.1007/s12217-026-10279-8

Sana Ansari, Nikhil Kumar Singh

{"title":"Magnetic Nanofluid Film Boiling Over a Flat Plate at Various Gravity Levels in the Presence of Non-Uniform Magnetic Field Generated by a Current-Carrying Wire","authors":"Sana Ansari, Nikhil Kumar Singh","doi":"10.1007/s12217-026-10279-8","DOIUrl":"10.1007/s12217-026-10279-8","url":null,"abstract":"<div><p>In this study, computations are performed for saturated magnetic nanofluid film boiling under the influence of non-uniform magnetic field (MF) generated by a current-carrying wire (CCW). The computations involve solving Maxwell’s equation for magnetic field in conjunction with a numerical framework developed for phase change problems based on the coupled level set and volume of fluid (CLSVOF) method. The numerical investigation is conducted for single-mode film boiling with various MF intensities and orientations, wall superheats, CCW locations, and gravity ratios. Results show that a vertically oriented non-uniform MF enhances bubble release frequency and heat transfer, whereas horizontally oriented MF produces negligible effects on bubble dynamics and heat transfer. The bubble formation is significantly delayed under reduced gravity, with only a slight increase in the vapor layer thickness, while non-uniform MF reduces bubble departure time. In the absence of MF, an increase in wall superheat enhances heat transfer under Earth’s gravity, which is not observed with MF showing that heat transfer enhancement induced by MF is more effective at lower superheats. Conversely, under reduced gravity, MF enhances the positive effect of wall superheat on heat transfer. Further, MF can advance or impede bubble growth and release depending on CCW location. Under Earth gravity, placing CCW close to central axis promotes earlier bubble detachment, whereas placing it far away delays bubble departure. Interestingly, this behaviour is reversed under reduced gravity. However, time-averaged Nusselt number attains a maximum when CCW is positioned near the central axis regardless of gravity.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148838277","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