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Abstract

This paper presents a numerical analysis of the thermal-flow characteristics for a laminar flow inside a rectangular microchannel. The flow of water through channels with thin obstacles mounted on opposite walls was analyzed. The studies were conducted with a low Reynolds number (from 20 to 200). Different heights of rectangular obstacles were analyzed to see if geometrical factors influence fluid flow and heat exchange in the microchannel. Despite of the fact that the use of thin obstacles in the microchannels leads to an increase in the pressure drop, the increase in the height of the obstacles favors a significant intensification of heat exchange with the maximum thermal gain factor of 1.9 for the obstacle height coefficient h/H=0.5, which could be acceptable for practical application.
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Bibliography

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[9] G. Wang, T. Chen, M. Tian, and G. Ding. Fluid and heat transfer characteristics of microchannel heat sink with truncated rib on sidewall. International Journal of Heat and Mass Transfer, 148:119142, 2020. doi: 10.1016/j.ijheatmasstransfer.2019.119142.
[10] S. Mahjoob and S. Kashkuli. Thermal transport analysis of injected flow through combined rib and metal foam in converging channels with application in electronics hotspot removal. International Journal of Heat and Mass Transfer, 177:121223, 2021. doi: 10.1016/j.ijheatmasstransfer.2021.121223.
[11] L. Chai, G.D. Xia, and H.S. Wang. Numerical study of laminar flow and heat transfer in microchannel heat sink with offset ribs on sidewalls. Applied Thermal Engineering, 92:32–41, 2016. doi: 10.1016/j.applthermaleng.2015.09.071.
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Authors and Affiliations

Małgorzata Kmiotek
1
ORCID: ORCID
Robert Smusz
1
ORCID: ORCID

  1. Rzeszow University of Technology, The Faculty of Mechanical Engineering and Aeronautics, Rzeszow, Poland
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Abstract

The paper presents numerical simulation of two-phase flow in a heated capillary with evaporation on the meniscus. To solve the problem, a model of evaporation from meniscus was developed in which the dynamics of liquid-vapour interface is described by the Cahn-Hilliard equation. The numerical simulations were performed using commercial software for 2D axially symmetric case. The flow evolution was analysed for different values of heat transfer coefficient at the capillary wall and inlet liquid mass flow rate.
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Authors and Affiliations

Jarosław Karwacki
Marcin Lackowski
Helena Nowakowska
Dariusz Butrymowicz
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Abstract

A principle diagram of a high-voltage low-power power supply for devices comprising a microchannel plate (MCP) has been developed. A mathematical model was built according to the developed scheme for a detailed study of the operation of the power supply and the selection of the optimal parameters of its components and obtaining the best output voltages. The power supply circuit comprises a control circuit, a pulse transformer, a voltage multiplier circuit, a feedback circuit, and an input stabilizer. The input stabilizer provides the maintenance of the voltage switched in the primary winding of the transformer at a given level regardless of the voltage drop of the power supply primary source. Moreover the stabilizer provides constant voltage maintenance when the load resistance changes. (with Rload changing from 100 to 200 MΩ, Uout did not exceed 3 V).
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Bibliography

[1]. Rosanna Rispoli, Elisabetta De Angelis, Luca Colasanti, Nello Vertolli, Stefano Orsini «ELENA microchannel plate detector: absolute detection efficiency for low energy neutral atoms», Optical Engineering, 2013.
[2]. O. Chassela A. Grigoreiv A. Fedorov N. André, «Resistance and gain of the microchannel plate (MCP) detector as a function of temperature», International Conference on Space Optics—ICSO, 2018.
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[4]. Zhi Qiang, Yang Ye, Yan Bo, Li Jun-guo, Ni Xiao-bing, Wang Yu, Yao Ze, «The Cathode Control Circuit Design of Auto-Gating Power Supply for Low-Light-Level Image Intensifier», Science and Technology on Low-Light-Level Night Vision Laboratory, Xi’an, China, 2015.
[5]. Chengquan Peia, Jinshou Tianb, Zhen Liua, Hong Qinc, Shengli Wua, «A novel ZVS high voltage power supply for micro-channel plate photomultiplier tubes», 2017.
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Authors and Affiliations

Boris Martemianov
1
Alexander Ryzhkov
1
Grigoriy Vdovin
1

  1. Limited Liability Company Vladikavkaz Technological Center "BASPIK", North Osetia

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