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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F14%3A00208768" target="_blank" >RIV/62156489:43410/14:00208768 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.ijthermalsci.2013.09.007" target="_blank" >http://dx.doi.org/10.1016/j.ijthermalsci.2013.09.007</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijthermalsci.2013.09.007" target="_blank" >10.1016/j.ijthermalsci.2013.09.007</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 ofthis 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 THBmethod 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

Název v anglickém jazyce

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

Popis výsledku anglicky

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 ofthis 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 THBmethod 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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BJ - Termodynamika

OECD FORD obor

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Projekt

<a href="/cs/project/EE2.3.30.0017" target="_blank" >EE2.3.30.0017: Postdoktorandi v oborech biologických věd na MENDELU</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Journal of Thermal Sciences

ISSN

1290-0729

e-ISSN

—

Svazek periodika

76

Číslo periodika v rámci svazku

Feb 2014

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

200-207

Kód UT WoS článku

328804500018

EID výsledku v databázi Scopus

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