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Micromachines
Special Issues
Heat Transfer and Fluid Flow in Micromachines, Volume III
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Heat Transfer and Fluid Flow in Micromachines, Volume III

A special issue of Micromachines (ISSN 2072-666X).

Deadline for manuscript submissions: closed (30 December 2023) | Viewed by 2483

Special Issue Editors

Dr. Jinyuan Qian

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Guest Editor
Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
Interests: flow control; heat transfer; hydraulics; computational fluid dynamics
Special Issues, Collections and Topics in MDPI journals
Dr. Dongyu Chen

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Guest Editor
Department of Computer Science, University of Central Florida, Orlando, FL 32816, USA
Interests: thermal energy storage; multiphase flow; HVAC&R; Lattice Boltzmann method
Dr. Zan Wu

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Guest Editor
Department of Energy Sciences, Lund University, 221 00 Lund, Sweden
Interests: boiling and condensation; heat transfer; microfluidics; surface modification
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Junhui Zhang

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Guest Editor
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China
Interests: flow control; aviation hydraulic; hydraulic robot
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Bengt Sunden

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Guest Editor
Department of Energy Sciences, Lund University, 221 00 Lund, Sweden
Interests: PEMFC; SOFC; batteries; hydrogen production and storage; renewable energy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the advances in manufacturing technology, more and more micromachines have been successfully developed, such as microchannel, micro mixer, micro pump, micro reactor, micro valve, microfluidics, and MEMS. In recent years, micromachine applications have also experienced rapid development in many industries.  In micromachines, due to the large surface-to-volume ratio, heat transfer and fluid flow characteristics inside have obvious differences, compared with those at normal size, e.g., different cavitation phenomena, different boiling, and condensation characteristics.  Thus, heat transfer and fluid flow characteristics in micromachines have been attracting many researchers, with the purpose of innovative heat transfer enhancement and smart fluid control flow. Many new innovative findings and enabling technologies have appeared. Accordingly, it is important to collect and present these recent advances. This Special Issue on “Heat Transfer and Fluid Flow in Micromachines”, welcomes review articles and original research papers, fundamental or applied, theoretical, numerical, or experimental, on heat transfer and fluid flow in micromachines. Topics of interest include but are not limited to the following: 

  • Boiling
  • Cavitation
  • Compressible flow
  • Condensation
  • Flow control
  • Flow rate
  • Fluid dynamics
  • Fluid flow
  • Fluid power
  • Heat transfer
  • Heat exchanger
  • Hydraulics
  • Lab-on-a-chip
  • Mass transfer
  • MEMS
  • Microchannel
  • Microfluidics
  • Micro mixer
  • Micro pump
  • Micro reactor
  • Micro valve
  • Multiphase flow
  • Nanofluidics
  • Nanofluids

Dr. Jin-yuan Qian
Dr. Dongyu Chen
Dr. Zan Wu
Prof. Dr. Junhui Zhang
Prof. Dr. Bengt Sunden
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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Published Papers (2 papers)

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Research

16 pages, 4346 KiB  
Article
Influence of Non-Newtonian Viscosity on Flow Structures and Wall Deformation in Compliant Serpentine Microchannels: A Numerical Study
by Khemraj Deshmukh, Kunal Mitra and Arindam Bit
Micromachines 2023, 14(9), 1661; https://doi.org/10.3390/mi14091661 - 25 Aug 2023
Cited by 1 | Viewed by 827
Abstract
The viscosity of fluid plays a major role in the flow dynamics of microchannels. Viscous drag and shear forces are the primary tractions for microfluidic fluid flow. Capillary blood vessels with a few microns diameter are impacted by the rheology of blood flowing [...] Read more.
The viscosity of fluid plays a major role in the flow dynamics of microchannels. Viscous drag and shear forces are the primary tractions for microfluidic fluid flow. Capillary blood vessels with a few microns diameter are impacted by the rheology of blood flowing through their conduits. Hence, regenerated capillaries should be able to withstand such impacts. Consequently, there is a need to understand the flow physics of culture media through the lumen of the substrate as it is one of the vital promoting factors for vasculogenesis under optimal shear conditions at the endothelial lining of the regenerated vessel. Simultaneously, considering the diffusive role of capillaries for ion exchange with the surrounding tissue, capillaries have been found to reorient themselves in serpentine form for modulating the flow conditions while developing sustainable shear stress. In the current study, S-shaped (S1) and delta-shaped (S2) serpentine models of capillaries were considered to evaluate the shear stress distribution and the oscillatory shear index (OSI) and relative residual time (RRT) of the derivatives throughout the channel (due to the phenomena of near-wall stress fluctuation), along with the influence of culture media rheology on wall stress parameters. The non-Newtonian power-law formulation was implemented for defining rheological viscosity of the culture media. The flow actuation of the media was considered to be sinusoidal and physiological, realizing the pulsatile blood flow behavior in the circulatory network. A distinct difference in shear stress distributions was observed in both the serpentine models. The S1 model showed higher change in shear stress in comparison to the S2 model. Furthermore, the non-Newtonian viscosity formulation was found to produce more sustainable shear stress near the serpentine walls compared to the Newtonian formulation fluid, emphasizing the influence of rheology on stress generation. Further, cell viability improved in the bending regions of serpentine channels compared to the long run section of the same channel. Full article
(This article belongs to the Special Issue Heat Transfer and Fluid Flow in Micromachines, Volume III)
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18 pages, 3346 KiB  
Article
Flow Pattern Study and Pressure Drop Prediction of Two-Phase Boiling Process in Different Surface Wettability Microchannel
by Yuqi Zhang, Haoxian Wu, Ling Zhang, Yunbo Yang, Xiangdong Niu, Zerong Zeng and Bifen Shu
Micromachines 2023, 14(5), 958; https://doi.org/10.3390/mi14050958 - 28 Apr 2023
Viewed by 1373
Abstract
An experimental study of two-phase flow pressure drop using R-134a is conducted on three types of different surface wettability microchannels with superhydrophilic (contact angle of 0°), hydrophilic (contact angle of 43°) and common (contact angle of 70°, unmodified) surfaces, all with a hydraulic [...] Read more.
An experimental study of two-phase flow pressure drop using R-134a is conducted on three types of different surface wettability microchannels with superhydrophilic (contact angle of 0°), hydrophilic (contact angle of 43°) and common (contact angle of 70°, unmodified) surfaces, all with a hydraulic diameter of 0.805 mm. Experiments were conducted using a mass flux of 713–1629 kg/m2s and a heat flux of 7.0–35.1 kW/m2. Firstly, the bubble behavior during the two-phase boiling process in the superhydrophilic and common surface microchannel is studied. Through a large number of flow pattern diagrams under different working conditions, it is found that the bubble behavior shows different degrees of order in microchannels with different surface wettability. The experimental results show that the hydrophilic surface modification of microchannel is an effective method to enhance heat transfer and reduce friction pressure drop. Through the data analysis of friction pressure drop and C parameter, it is found that the three most important parameters affecting the two-phase friction pressure drop are mass flux, vapor quality, and surface wettability. Based on flow patterns and pressure drop characteristics obtained from the experiments, a new parameter, named flow order degree, is proposed to account for the overall effects of mass flux, vapor quality, and surface wettability on two-phase frictional pressure drop in microchannels, and a newly developed correlation based on the separated flow model is presented. In the superhydrophilic microchannel, the mean absolute error of the new correlation is 19.8%, which is considerably less than the error of the previous models. Full article
(This article belongs to the Special Issue Heat Transfer and Fluid Flow in Micromachines, Volume III)
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