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Kaniowski R, Pastuszko R. Comparison of heat transfer coefficients of open micro-channels and plain micro-fins. EPJ WEB OF CONFERENCES 2018. [DOI: 10.1051/epjconf/201818002041] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The paper describes results of analysis of pool boiling heat transfer on enhanced surfaces. Two types of structural surfaces were used: open microchannel surfaces consisting of a system of parallel micro-channels 0.3 mm wide, from 0.2 to 0.5 mm deep and with a pitch of 0.6 mm, and plain micro-fins 0.5 mm in height, uniformly spaced on the base surface with a spacing from 0.6 to1.5 mm. Pool boiling data at atmospheric pressure were obtained for saturated water, ethanol and FC-72. The effects of micro-channel/micro-fin dimensions on heat transfer coefficient in nucleate pool boiling were examined. Substantial enhancement of heat transfer coefficient was observed.
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Strąk K, Piasecka M. Impact of different thickness of the smooth heated surface on flow boiling heat transfer. EPJ WEB OF CONFERENCES 2018. [DOI: 10.1051/epjconf/201818002098] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
This paper presents a comparison of the performance of three smooth heated surfaces with different thicknesses. Analysis was carried out on an experimental setup for flow boiling heat transfer. The most important element of the setup was the test section with a rectangular minichannel, 1.7 mm deep, 16 mm wide and 180 mm long, oriented vertically. The heated element for the FC-72 Fluorinert flowing in the minichannel was designated as a Haynes-230 alloy plate (0.10 mm and 0.45 mm thick) or a Hastelloy X alloy plate (0.65 mm thick). Infrared thermography was used to measure the temperature of the outer plate surface. The local values of the heat transfer coefficient for stationary state conditions were calculated using a simple one-dimensional method. The experimental results were presented as the relationship between the heat transfer coefficients in the subcooled boiling region and the distance along the minichannel length and boiling curves. The highest local heat transfer coefficients were recorded for the surface of 0.10 mm thick heated plate at the outlet and 0.45 mm thick plate at the minichannel inlet. All boiling curves were typical in shape.
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Kalawa W, Wójcik TM, Piasecka M. Heat transfer research on enhanced heating surfaces in pool boiling. EPJ WEB OF CONFERENCES 2017. [DOI: 10.1051/epjconf/201714302048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Piasecka M, Michalski D, Strąk K. Comparison of two methods for contactless surface temperature measurement. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611402094] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Hożejowska S, Musiał T, Piasecka M. Heat transfer coefficient for flow boiling in an annular mini gap. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611402042] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Maciejewska B, Strąk K, Piasecka M. Determination of the heat transfer coefficient from IRT measurement data using the Trefftz method. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611402068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Pastuszko R. Enhanced pool boiling heat transfer on mini- and micro- structured surfaces. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611401002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Piasecka M, Strąk K. Effect of the heating surface enhancement on the heat transfer coefficient for a vertical minichannel. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611402095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Piasecka M, Ziętala K. Impact of selected parameters on the development of boiling and flow resistance in the minichannel. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20159202069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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