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Cooling effectiveness of droplets at low Weber numbers: Effect of temperature
The impact of water droplets onto a heated non-isothermal surface is studied numerically using the VOF methodology and assuming a 2D-axisymmetric computational domain. An adaptive grid refinement technique in both the fluid and the solid phases is used to solve the conjugate problem of fluid flow an...
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Published in: | International journal of thermal sciences 2013-10, Vol.72, p.60-72 |
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container_title | International journal of thermal sciences |
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creator | Strotos, George Nikolopoulos, Nikos Nikas, Konstantinos-Stephen Moustris, Kostas |
description | The impact of water droplets onto a heated non-isothermal surface is studied numerically using the VOF methodology and assuming a 2D-axisymmetric computational domain. An adaptive grid refinement technique in both the fluid and the solid phases is used to solve the conjugate problem of fluid flow and heat transfer. Parametric studies examine the effect of initial solid surface temperature and initial droplet temperature, while all the other parameters which affect the temporal evolution of the phenomenon are kept constant; the wall temperatures examined are low enough to prevent the onset of nucleate boiling. It is proved that the variables describing the temporal evolution of the phenomenon evolve with the same way when they are non-dimensionalised with expressions arising from the transient heat conduction theory. Additionally, a formula for the maximum droplet spreading which accounts for the droplet heating during spreading is proposed, as also semi-analytical expressions which describe the thermal behaviour of the droplet
•Conjugate solution of energy equation for an impacting droplet onto a heated wall.•VOF methodology coupled with an adaptive local grid refinement technique.•Detailed examination of the effect of temperature on the cooling effectiveness of droplets.•Useful relationships are provided which describe the thermal behaviour of the droplet. |
doi_str_mv | 10.1016/j.ijthermalsci.2013.05.008 |
format | article |
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•Conjugate solution of energy equation for an impacting droplet onto a heated wall.•VOF methodology coupled with an adaptive local grid refinement technique.•Detailed examination of the effect of temperature on the cooling effectiveness of droplets.•Useful relationships are provided which describe the thermal behaviour of the droplet.</description><subject>Applied sciences</subject><subject>Computational fluid dynamics</subject><subject>Droplet</subject><subject>Droplets</subject><subject>Energy</subject><subject>Energy. Thermal use of fuels</subject><subject>Evolution</subject><subject>Exact sciences and technology</subject><subject>Fluid flow</subject><subject>Fluids</subject><subject>Heat transfer</subject><subject>Heated wall</subject><subject>Mathematical analysis</subject><subject>Mathematical models</subject><subject>Spreading</subject><subject>Theoretical studies. Data and constants. 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Metering</topic><topic>Transient conduction</topic><topic>VOF</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Strotos, George</creatorcontrib><creatorcontrib>Nikolopoulos, Nikos</creatorcontrib><creatorcontrib>Nikas, Konstantinos-Stephen</creatorcontrib><creatorcontrib>Moustris, Kostas</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>International journal of thermal sciences</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Strotos, George</au><au>Nikolopoulos, Nikos</au><au>Nikas, Konstantinos-Stephen</au><au>Moustris, Kostas</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Cooling effectiveness of droplets at low Weber numbers: Effect of temperature</atitle><jtitle>International journal of thermal sciences</jtitle><date>2013-10-01</date><risdate>2013</risdate><volume>72</volume><spage>60</spage><epage>72</epage><pages>60-72</pages><issn>1290-0729</issn><eissn>1778-4166</eissn><notes>ObjectType-Article-1</notes><notes>SourceType-Scholarly Journals-1</notes><notes>ObjectType-Feature-2</notes><notes>content type line 23</notes><abstract>The impact of water droplets onto a heated non-isothermal surface is studied numerically using the VOF methodology and assuming a 2D-axisymmetric computational domain. An adaptive grid refinement technique in both the fluid and the solid phases is used to solve the conjugate problem of fluid flow and heat transfer. Parametric studies examine the effect of initial solid surface temperature and initial droplet temperature, while all the other parameters which affect the temporal evolution of the phenomenon are kept constant; the wall temperatures examined are low enough to prevent the onset of nucleate boiling. It is proved that the variables describing the temporal evolution of the phenomenon evolve with the same way when they are non-dimensionalised with expressions arising from the transient heat conduction theory. Additionally, a formula for the maximum droplet spreading which accounts for the droplet heating during spreading is proposed, as also semi-analytical expressions which describe the thermal behaviour of the droplet
•Conjugate solution of energy equation for an impacting droplet onto a heated wall.•VOF methodology coupled with an adaptive local grid refinement technique.•Detailed examination of the effect of temperature on the cooling effectiveness of droplets.•Useful relationships are provided which describe the thermal behaviour of the droplet.</abstract><cop>Kidlington</cop><pub>Elsevier Masson SAS</pub><doi>10.1016/j.ijthermalsci.2013.05.008</doi><tpages>13</tpages></addata></record> |
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subjects | Applied sciences Computational fluid dynamics Droplet Droplets Energy Energy. Thermal use of fuels Evolution Exact sciences and technology Fluid flow Fluids Heat transfer Heated wall Mathematical analysis Mathematical models Spreading Theoretical studies. Data and constants. Metering Transient conduction VOF |
title | Cooling effectiveness of droplets at low Weber numbers: Effect of temperature |
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