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Experimental and numerical investigation of evaporation heat transfer in the vicinity of the 3-phase contact line

Ibrahem, K. and Abd Rabbo, M. F. and Gambaryan-Roisman, Tatiana and Stephan, Peter (2010):
Experimental and numerical investigation of evaporation heat transfer in the vicinity of the 3-phase contact line.
In: Proceedings Third International Conference on Thermal Issues in Emerging Technologies, [Conference or Workshop Item]

Abstract

An experimental study is conducted to investigate the local heat flow at a solid--liquid--vapor contact line. A vertical channel of 600 \textgreekmm width is built using two parallel flat plates; a 10 \textgreekmm thick stainless steel heating foil forms a part of one of the flat plates. A liquid--vapor meniscus is formed between the plates due to capillary forces. In this study the fluid HFE7100 is evaporated inside the channel under steady state conditions. Two-dimensional microscale temperature fields at the back side of the heating foil are observed with a infrared camera with a spatial resolution of 14.8 \textgreekmm × 14.8 \textgreekmm. An in situ calibration procedure is applied. The measured local wall temperature difference between the contact line area and the bulk liquid is up to 12 K. The liquid front undergoes a slow oscillatory motion which can be attributed to the instability of evaporating 3-phase contact line. The local heat fluxes from the heater to the evaporating meniscus are calculated from the measured wall temperatures using an energy balance for each pixel element. The local heat fluxes at the contact line area are found to be about 5.4--6.5 times higher than the mean input heat fluxes at the foil.

Item Type: Conference or Workshop Item
Erschienen: 2010
Creators: Ibrahem, K. and Abd Rabbo, M. F. and Gambaryan-Roisman, Tatiana and Stephan, Peter
Title: Experimental and numerical investigation of evaporation heat transfer in the vicinity of the 3-phase contact line
Language: German
Abstract:

An experimental study is conducted to investigate the local heat flow at a solid--liquid--vapor contact line. A vertical channel of 600 \textgreekmm width is built using two parallel flat plates; a 10 \textgreekmm thick stainless steel heating foil forms a part of one of the flat plates. A liquid--vapor meniscus is formed between the plates due to capillary forces. In this study the fluid HFE7100 is evaporated inside the channel under steady state conditions. Two-dimensional microscale temperature fields at the back side of the heating foil are observed with a infrared camera with a spatial resolution of 14.8 \textgreekmm × 14.8 \textgreekmm. An in situ calibration procedure is applied. The measured local wall temperature difference between the contact line area and the bulk liquid is up to 12 K. The liquid front undergoes a slow oscillatory motion which can be attributed to the instability of evaporating 3-phase contact line. The local heat fluxes from the heater to the evaporating meniscus are calculated from the measured wall temperatures using an energy balance for each pixel element. The local heat fluxes at the contact line area are found to be about 5.4--6.5 times higher than the mean input heat fluxes at the foil.

Divisions: 16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
16 Department of Mechanical Engineering
Zentrale Einrichtungen
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Event Title: Proceedings Third International Conference on Thermal Issues in Emerging Technologies
Date Deposited: 17 Mar 2015 15:12
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