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Mixing Performance of an Electroosmotic Micromixer: Effect of Baffle 1

引用

1st International Conference on Fluid, Thermal and Energy Systems, ICFTES 2022

作者： Gayen, Biswajit Manna, Nirmal K. Biswas, Nirmalendu Department of Mechanical Engineering Jadavpur University Kolkata700032 India Department of Power Engineering Jadavpur University Salt Lake Kolkata700106 India Department of Mechanical Engineering MCKV Institute of Engineering Howrah711204 India

ISBN: (数字)9789819959907

ISBN: (纸本)9789819959891

In recent years, electrokinetic effects, viz., electroosmotic flow and electrophoretic phenomenon finds applications in the field of micromixing. To address such an application, we present a novel approach to micromixing. In our present study, simulation has been performed for Mixing Quality (MQ) of two different concentration fluids in one ring-shaped micromixer using electroosmotic flow. The micromixer consists of two pairs of electrodes at the outer surface of the micromixer at specific locations, also two baffles are considered at prescribed distances from the inlets of the micromixer. The two electrode pairs are excited by an alternating current (AC) and can generate micro-vortices near the electrodes even for a highly ordered laminar flow, as a result of efficient mixing. In the present study, two baffles are also considered to enhance the mixing quality. Comsol Multiphysics solver has been employed to carry out the simulations. We have considered Navier–Stokes equation to know the flow field and the convection–diffusion equation to know the concentration field. The proposed model can achieve 95.61% mixing quality at the inlet velocity of 0.05 mm/s. A comparison study has also been performed between one ring-shaped micromixer with and without baffles. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.

关键词： Electrodes

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Estimation of Inlet Conditions of Fluid Flow in a Thick Pipe Using Inverse Technique 1

引用

9th International and 49th National Conference on Fluid Mechanics and Fluid Power, FMFP 2022

作者： Dinesh Reddy, K. Konda Reddy, B. Department of Mechanical Engineering IIIT RK Valley RGUKT AP YSR Kadapa India

ISBN: (数字)9789819957552

ISBN: (纸本)9789819957545

A conjugate heat transfer problem of steady laminar flow in a circular pipe with a thick wall is considered for estimating inlet conditions of fluid flow in a thick pipe. An inverse method is used to estimate the unknown velocity and temperature of the fluid at the inlet of the pipe based on temperature data obtained on the outer surface along the pipe's length by subjecting the pipe's outer surface to uniform heat flux. Simulations are run for two-dimensional steady laminar flow in COMSOL for different data sets of inlet velocity and inlet temperature to obtain the temperature data along the length of the pipe. Then the curve is fitted using this data by using nonlinear regression analysis with the Bayesian framework. This fitted curve acts as a forward model for estimating the flow conditions at the inlet. The simulated and surrogated temperatures are compared using a Bayesian framework for the guess sample of parameters. To sample the parameter space of inlet conditions (vi, Ti) of fluid flow, Metropolis–Hastings algorithm has been used. Point estimates of v and T and their associated standard deviation (SD) are estimated. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Inverse problems

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Parametric Investigation of Droplet Generation Inside T-Junction Microchannel 1

引用

1st International Conference on Fluid, Thermal and Energy Systems, ICFTES 2022

作者： Jena, Santosh Kumar Srivastava, Tushar Kondaraju, Sasidhar School of Mechanical Sciences Indian Institute of Technology Bhubaneswar Odisha Argul752050 India

ISBN: (数字)9789819959907

ISBN: (纸本)9789819959891

Droplet generation inside the microchannel and its manipulation are one of essential droplet microfluidics processes. Many researchers study the physics behind droplet generation inside the T-junction microchannel;still, a thorough understanding of the concepts behind droplet formation is missing. The current investigation focuses on the parametric study of aqueous droplets in oil for a T-channel. This study examines the impact of numerous parameters, including the continuous phase capillary number (Cac), flow rate ratio (), and various fluid combinations, as well as the dispersed phase Weber number (Wed), on the droplet size and frequency of droplet formation within a T-channel. Different flow patterns like squeezing, dripping, and jetting regimes are observed from flow visualization. The variation of droplet length due to Wed is studied for a constant Cac. In-house experiments are conducted for Cac = 0.0004–0.2, flow rate ratios ( = 1, 0.5, 0.25), and for varying Wed. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.

关键词： Microchannels

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A Short Review on Wellbore Heat Exchangers 1

引用

1st International Conference on Fluid, Thermal and Energy Systems, ICFTES 2022

作者： Chappidi, Srinivas Kumar, Ankesh Singh, Jogender Department of Civil Engineering SVNIT Surat Gujarat Surat395007 India Department of Chemical Engineering SVNIT Surat Gujarat Surat395007 India

ISBN: (数字)9789819959907

ISBN: (纸本)9789819959891

Wellbore geothermal heat exchanger (GHE) with a single well system is a promising technology for geothermal energy extraction from hot dry rock resources and abandoned wells. In comparison to the conventional two-well geothermal energy extraction systems, a single-well geothermal heat exchanger may reduce the cost and environmental impact. However, the optimization of the wellbore GHE is necessary to achieve higher thermal power due to higher outlet fluid temperature. Thus, the paper briefly reviews various wellbore GHEs and their thermal performance. The effect of the various parameters viz. geothermal gradient, inlet fluid temperature, mass flow rate, and operating time on the system’s thermal performance is also reviewed. Thus, the present study may aid the development of novel wellbore GHEs with higher heat extraction efficiencies. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.

关键词： Geothermal energy

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Rigid-Vortex Configurations of Four Point Vortices 1

引用

9th International and 49th National Conference on Fluid Mechanics and Fluid Power, FMFP 2022

作者： Kallyadan, Sreethin Sreedharan Shukla, Priyanka Department of Mathematics IIT Madras Chennai600036 India

ISBN: (数字)9789819957552

ISBN: (纸本)9789819957545

In this work, we numerically investigate the distribution of initial vortex arrangements that result in the rigid vortex motion of four point vortices on the unbounded plane. A 6 × 4 configuration matrix can be assigned for each vortex configuration, whose null space determines the possibility of a rigid vortex motion. A systematic study of the rigid vortex configurations is provided based on the symmetry of inter-vortex distances. Furthermore, it is shown that rigid vortex configurations generally exist as one-dimensional continua with a bounded and an unbounded component, along which the associated circulations vary continuously. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Vortex flow

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Productivity Improvement by Upgrading Skills Using TWI–JI in Special Purpose Machine Manufacturing Company 1

引用

International Conference on Production and Industrial engineering, CPIE 2023

作者： Gambhire, Gajanan Umrani, Anand Nilawar, Hritikesh Kharkar, Atharwa Patil, Himanshu Vishwakarma Institute of Technology Pune411037 India Executive Industrial Engineer Tata Boeing Aerospace Hyderabad India

ISBN: (数字)9789819983438

ISBN: (纸本)9789819983421

In the competitive world, most organizations adopt modern tools and techniques for improving their productivity without hammering other business objectives. However, in developing countries like India, which are labor intensive at the same time industry faces a paucity of skilled personnel. In order to achieve success and be profitable, MSMEs are greatly dependent on skilled operators. This study was conducted at a medium-scale special purpose machine manufacturing enterprise for operator's skill enhancement. The objective of the proposed research is to model Training Within Industry–Job Instruction (TWI-JI) management approach to empower the skills among the operators and assess them using the skill matrix and job breakdown sheet (JBS). The welding operators’ skill data has been collected and mapped for different types of welding and assembly operations. Pre-post analysis is performed using certain rating parameters to assess operators’ proficiency for TWI-JI. The implementation of TWI-JI resulted in an overall improvement of the average skill level of the welding section by 14.92%, average operator-wise skill improvement by 14.96%, and an average increase in production output is 20.12%. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Personnel training

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Automated Processes for Preparing a Point Cloud Within the Scan-To-BIM Methodology 1

引用

32nd International conference on The Digital Transformation in the Graphic engineering, INGEGRAF 2023

作者： Tavolare, Riccardo Buldo, Michele Verdoscia, Cesare Department of Civil Environmental Land Construction and Chemistry Polytechnic University of Bari Bari Italy

ISBN: (数字)9783031516238

ISBN: (纸本)9783031516221

The Architecture engineering Construction (AEC) industry is increasingly considering and taking up Building Information Modelling (BIM), with different tricks and depending on development needs. Scan-to-BIM methodologies, which enable the creation of the as-built digital model starting from the point cloud collection and processing, which have been widely used recently, are the first reference step in the digital representation and reproduction of architectural and structural elements. In this context, a holistic method is proposed relying on the adoption of an efficient workflow for the arrangement of a point cloud, referring to a disused industrial building, for subsequent ensuing BIM authoring procedures. Throughout the model creation process, as well as segmentation techniques, were employed to ensure the preservation of significant geometric and semantic information. Based on reference height levels, it was decided to apply an initial splitting of the point cloud. After adopting different denoising techniques to remove unnecessary points, the items were semi-automatically grouped into separate point clouds using classification procedures, and model-fitting algorithms were utilised to find dominating planes connected to some analysed elements. The final stage, decimation, enabled the analysis of a point cloud that had been thoroughly cleaned up and streamlined in which the building elements deemed to be crucial to the modeling procedures had already been identified. This provides vetting in a multi-user and multi-disciplinary BIM authoring environment while maintaining a shared spatial reference. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Semantics

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Influence of Cryogenic Temperature on Degradation of Step-Graded Scaffold: A CFD Study 1

引用

9th International and 49th National Conference on Fluid Mechanics and Fluid Power, FMFP 2022

作者： Deshmukh, Khemraj Bit, Arindam Department of Biomedical Engineering National Institute of Technology Raipur India

ISBN: (数字)9789819963430

ISBN: (纸本)9789819963423

Cryopreservation technology is used for the storage of biological substances. The present work shows the effect of cryogenic temperature (230 °K) on graded PDMS scaffold degradation at the different rates of cooling (− 5, − 2 and − 1 °K/min). Different 2D structures of 5 × 5 PDMS scaffolds had been designed by variation of hole distance and hole diameter. Transient analysis of different structures was evaluated for defined rate of cooling by using of fully coupled heat transfer in solid and fluid along with solid mechanics physics. Five different parameters (temperature, stress, displacement gradient, strain tensor and deformation gradient) associated with scaffold degradation were observed in the presence of water at the different region of interest (ROI). The result shows that significant variation had been found in all parameters affecting the scaffold's degradation. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Transient analysis

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Applying Participatory Design to the Creation of New Mini Sculpture Products from the ARTKIT4KIDS Series 1

引用

32nd International conference on The Digital Transformation in the Graphic engineering, INGEGRAF 2023

作者： Torres, Oly Carolina Díaz López, María Victoria Esgueva Universitat Politècnica de València Valencia Spain

ISBN: (数字)9783031516238

ISBN: (纸本)9783031516221

UCD theorists place the user at the center of all stages of the product development process. From this perspective, in recent years a transformation based on analyzing the user's needs and the search for satisfaction has been consolidated, by adjusting to a process in which the following key factors are essential: 1. Understand and know the final user 2. Design a product that meets their needs, according to their motivations and expectations 3. Test the product to evaluate the experience had during its use [1]. Based on this methodology, which frames an integral procedure of the design process, we approach this research that is based on the design of a game for artistic creation. The starting point is the need to rekindle the connection between human relationships with the interaction between the game and art, putting into practice the use of this methodology to empathize and learn from the user. We start from the medium of painting, to create a product/service that the user can use with the aim of having fun and expanding their artistic knowledge of colour, composition, and psychomotor skills. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Toys

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Effect of Fluid Visco-Temperature Properties on Pilot-Operated Relief Valve Stability 1

引用

11th International Conference on Mechatronics and Control engineering, ICMCE 2023

作者： Wang, Dong Yin, Yaobao Yuan, Jiayang Fu, Junyong Li, Wending Tongji University Shanghai City201804 China Shanghai Aerospace Control Technology Institute Shanghai City201109 China

ISBN: (数字)9789819965236

ISBN: (纸本)9789819965229

The viscosity of fluid varies with temperature, and the dynamic behavior of the relief valve may be impacted in this situation. After obtaining the oil visco-temperature properties, the dynamic mathematical model of a pilot-operated relief valve is derived. To obtain the effect of the visco-temperature properties on the stability of pilot-operated relief valves, the system transfer function block diagram is constructed. The frequency-domain analysis method was then utilised to investigate its dynamic behavior. The results suggest that the viscosity of the oil is thin at high temperatures, resulting in low flow resistance in the dynamic feedback orifice. In this case, the mass-spring vibration system composed of the main poppet and mechanical spring has a natural frequency close to the relief valve’s operating frequency, which is not conducive to the stability of the relief valve. The oil inside the main valve spring chamber, however, is equivalent to a liquid spring with an extraordinarily high stiffness since the viscosity of the fluid is thicker at low temperatures, which decreases the flow capacity of the orifice. The main valve’s mass spring vibration system has a natural frequency in this instance that is significantly higher than the valve’s operating frequency, enhancing the stability of the relief valve. Finally, the numerical simulation results demonstrate the rationality of the theoretical analysis. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Viscosity

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