About: Nonlinear finite element analysis of thermal inertia in heat-balance sap flow measurement

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	This paper deals with the numerical solution of a three-dimensional model of nonstationary nonlinear heat transfer in the sapwood of trees during sap flow measurement by a thermodynamic method based on volumetric heating of a stem segment (Trunk Heat Balance -- THB -- method). The model respects the dependence of physical properties on temperature and moisture and also the anisotropic nature of wood. The corresponding partial differential equation is then solved by finite element method. The main aim of this study was to analyze the thermal inertia of the THB method with horizontal references thermocouples. We compared the results of the simpler stationary and the more complex nonstationary model and we can conclude that the thermal inertia of the THB method is not negligible (mainly for smaller flows around 0.01 kg.m-2.s-1). In addition, the authors have shown that the influence of moisture on the recorded sap flow data Qrec is negligible but there is small influence on Qfic and hence on the resulting sap flow measurement as was shown in their previous work. We also tested two new variants of temperature sensors arrangement and proved that the difference between them is very small and can be ignored. This paper deals with the numerical solution of a three-dimensional model of nonstationary nonlinear heat transfer in the sapwood of trees during sap flow measurement by a thermodynamic method based on volumetric heating of a stem segment (Trunk Heat Balance -- THB -- method). The model respects the dependence of physical properties on temperature and moisture and also the anisotropic nature of wood. The corresponding partial differential equation is then solved by finite element method. The main aim of this study was to analyze the thermal inertia of the THB method with horizontal references thermocouples. We compared the results of the simpler stationary and the more complex nonstationary model and we can conclude that the thermal inertia of the THB method is not negligible (mainly for smaller flows around 0.01 kg.m-2.s-1). In addition, the authors have shown that the influence of moisture on the recorded sap flow data Qrec is negligible but there is small influence on Qfic and hence on the resulting sap flow measurement as was shown in their previous work. We also tested two new variants of temperature sensors arrangement and proved that the difference between them is very small and can be ignored. (en)
Title	Nonlinear finite element analysis of thermal inertia in heat-balance sap flow measurement Nonlinear finite element analysis of thermal inertia in heat-balance sap flow measurement (en)
skos:prefLabel	Nonlinear finite element analysis of thermal inertia in heat-balance sap flow measurement Nonlinear finite element analysis of thermal inertia in heat-balance sap flow measurement (en)
skos:notation	RIV/62156489:43410/14:00208768!RIV15-MSM-43410___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(EE2.3.30.0017)
http://linked.open...iv/cisloPeriodika	Feb 2014
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Čermák, Jan Trcala, Miroslav
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Mendelova univerzita v Brně / Lesnická a dřevařská fakulta
http://linked.open...dnocenehoVysledku	32793
http://linked.open...ai/riv/idVysledku	RIV/62156489:43410/14:00208768
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Trunk heat balance method; Thermal inertia; Sap flow measurement; Nonstationary and nonlinear heat transfer model; Finite element analysis (en)
http://linked.open.../riv/klicoveSlovo	Trunk heat balance method Finite element analysis Nonstationary and nonlinear heat transfer model Sap flow measurement Thermal inertia
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[0FBE08D1F82A]
http://linked.open...i/riv/nazevZdroje	International Journal of Thermal Sciences
http://linked.open...in/vavai/riv/obor	BJ
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Postdocs in Biological Sciences at MENDELU
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	76
http://linked.open...iv/tvurceVysledku	Čermák, Jan Trcala, Miroslav
http://linked.open...ain/vavai/riv/wos	328804500018
issn	1290-0729
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.ijthermalsci.2013.09.007
http://localhost/t...ganizacniJednotka	43410

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