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Micromachines
Special Issues
Micro/Nano-Scale Heat Transfer
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Micro/Nano-Scale Heat Transfer

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A：Physics".

Deadline for manuscript submissions: closed (15 April 2021) | Viewed by 4069

Special Issue Editors

Prof. Dr. Gian Luca Morini

E-Mail Website
Guest Editor
Dipartimento di Ingegneria Industriale (DIN), Alma Mater Studiorum Università di Bologna, 40136 Bologna, Italy
Interests: microfluidics; heat transfer in micro-devices; energy efficient buildings; heat pumps
Special Issues, Collections and Topics in MDPI journals
Dr. Yew Mun Hung

E-Mail Website
Guest Editor
Mechanical Engineering Discipline, School of Engineering, Monash University, Bandar Sunway 47500, Malaysia
Interests: microscale heat transfer; micro heat pipes; microchannels; phase-change heat transfer; electronics cooling; interfacial phenomena of graphene nanostructures
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The fast-paced progress in micromachining technology enables the fabrication of micron-sized mechanical devices. The miniaturization and increased functionality of modern devices induce an appreciable hike in the operating temperature, motivating research on microscale heat transfer to improve thermal management in confined space. Microscale heat transfer, in view of its efficiency and robustness in the thermal regulation of microscale cooling devices, micro-electromechanical systems, energy conversion devices, and other MEMS and biomedical applications, is of great value. Microscale cooling devices such as microchannel heat sinks, micro heat pipes and micro heat exchangers are increasingly important in current and future heat removal applications due to their large area-to-volume ratio, which induces high compactness and an effective heat removal rate. The incorporation of nanostructured materials such as nanoparticles, nanofluids and nanostructured surfaces into the micro-scale devices are important for the performance enhancement. The objective of this Special Issue is to present recent findings related to analytical, numerical, and experimental studies in micro/nano-scale heat transfer, with an emphasis on the basic understanding of the heat transfer processes and their applications to practical problems.

Prof. Dr. Gian Morini
Prof. Yew Mun Hung
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.

Keywords

  • Microchannels
  • Micro heat pipes
  • Micro heat exchangers
  • Microspray cooling
  • Microporous surfaces
  • Microstructured surfaces
  • Convection
  • Phase-change heat transfer
  • Capillary flow
  • Viscous dissipation

Related Special Issue

Published Papers (2 papers)

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Research

21 pages, 6258 KiB  
Article
Entropy Production in Electroosmotic Cilia Facilitated Stream of Thermally Radiated Nanofluid with Ohmic Heating
by Najma Saleem, Sufian Munawar, Ahmer Mehmood and Ibtisam Daqqa
Micromachines 2021, 12(9), 1004; https://doi.org/10.3390/mi12091004 - 24 Aug 2021
Cited by 17 | Viewed by 1828
Abstract
No thermal process, even the biological systems, can escape from the long arms of the second law. All living things preserve entropy since they obtain energy from the nutrition they consume and gain order by producing disorder. The entropy generation in a biological [...] Read more.
No thermal process, even the biological systems, can escape from the long arms of the second law. All living things preserve entropy since they obtain energy from the nutrition they consume and gain order by producing disorder. The entropy generation in a biological and thermally isolated system is the main subject of current investigation. The aim is to examine the entropy generation during the convective transport of a ciliated nano-liquid in a micro-channel under the effect of a uniform magnetic field. Joint effects of electroosmosis and thermal radiation are also brought into consideration. To attain mathematical simplicity, the governing equations are transformed to wave frame where the inertial parts of the transport equations are dropped with the use of a long-wavelength approximation. This finally produces the governing equations in the form of ordinary differential equations which are solved numerically by a shooting technique. The analysis reports that the cilia motion contributes to enhance the flow and heat transfer phenomena. An enhancement in the flow is observed near the channel surface for higher cilia length and for smaller values of the electroosmotic parameter. The entropy generation in the ciliated channel is observed to be lessened by intensifying the thermal radiation and decreasing the Ohmic heating. The extended and flexible cilia structure contributes to augment the volumetric flow rate and to drop the total entropy generation in the channel. Full article
(This article belongs to the Special Issue Micro/Nano-Scale Heat Transfer)
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16 pages, 3733 KiB  
Article
Thermal Analysis of a MEMS-Based Self-Adaptive Microfluidic Cooling Device
by Gonzalo Sisó, Joana Rosell-Mirmi, Álvaro Fernández, Gerard Laguna, Montse Vilarrubi, Jérôme Barrau, Manuel Ibañez and Joan Rosell-Urrutia
Micromachines 2021, 12(5), 505; https://doi.org/10.3390/mi12050505 - 30 Apr 2021
Cited by 1 | Viewed by 1616
Abstract
This study presents a thermal analysis of a temperature-driven microfluidic cell through a nonlinear self-adaptive micro valve that provides the mechanisms for the system to maintain a given critical temperature in an efficient way. For the description of the dynamics of the microfluidic [...] Read more.
This study presents a thermal analysis of a temperature-driven microfluidic cell through a nonlinear self-adaptive micro valve that provides the mechanisms for the system to maintain a given critical temperature in an efficient way. For the description of the dynamics of the microfluidic cell, a system of two ordinary differential equations subjected to a nonlinear boundary condition, which describes the behavior of the valve, is proposed. The solution of the model, for determined conditions, shows the strong nonlinearity between the overall thermal resistance of the device and the heat flux dissipated due to the action of the thermostatic valve, obtaining a variable thermal resistance from 1.6 × 10−5 to 2.0 × 10−4 Km2/W. In addition, a stability analysis of the temperature-driven microfluidic cell is presented. The stability of the device is essential for its proper functioning and thus, to prevent its oscillating behavior. Therefore, this work focuses on assessing the range of design parameters of the self-adaptive micro valve to produce a stable behavior for the entire system. The stability analysis was performed by studying the linear perturbation around the stationary solution, with the model solved for various heat flows, flow rates, and critical temperatures. Finally, a map of the design parameters space, which specifies the region with asymptotic stability, was found. In this map, the critical temperature (temperature at which the valve initiates the buckling) plays and important role. Full article
(This article belongs to the Special Issue Micro/Nano-Scale Heat Transfer)
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