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Statements

Subject Item
n2:RIV%2F62156489%3A43410%2F14%3A00208768%21RIV15-MSM-43410___
rdf:type
n11:Vysledek skos:Concept
dcterms: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.
dcterms: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
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
skos:notation
RIV/62156489:43410/14:00208768!RIV15-MSM-43410___
n3:aktivita
n4:P
n3:aktivity
P(EE2.3.30.0017)
n3:cisloPeriodika
Feb 2014
n3:dodaniDat
n7:2015
n3:domaciTvurceVysledku
n16:9375074 n16:6297013
n3:druhVysledku
n5:J
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
32793
n3:idVysledku
RIV/62156489:43410/14:00208768
n3:jazykVysledku
n12:eng
n3:klicovaSlova
Trunk heat balance method; Thermal inertia; Sap flow measurement; Nonstationary and nonlinear heat transfer model; Finite element analysis
n3:klicoveSlovo
n13:Nonstationary%20and%20nonlinear%20heat%20transfer%20model n13:Thermal%20inertia n13:Trunk%20heat%20balance%20method n13:Sap%20flow%20measurement n13:Finite%20element%20analysis
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[0FBE08D1F82A]
n3:nazevZdroje
International Journal of Thermal Sciences
n3:obor
n15:BJ
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
2
n3:projekt
n18:EE2.3.30.0017
n3:rokUplatneniVysledku
n7:2014
n3:svazekPeriodika
76
n3:tvurceVysledku
Trcala, Miroslav Čermák, Jan
n3:wos
328804500018
s:issn
1290-0729
s:numberOfPages
8
n19:doi
10.1016/j.ijthermalsci.2013.09.007
n8:organizacniJednotka
43410