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Heat transfer by seepage in sand : influence of saturated hydraulic conductivity and porosity
Ghafoori, Yaser (Author), Maček, Matej (Author), Vidmar, Andrej (Author), Říha, Jaromir (Author), Kryžanowski, Andrej (Author)

URLURL - Source URL, Visit https://actahydrotechnica.fgg.uni-lj.si/si/paper/a34yg This link opens in a new window
Language:English
Keywords:heat transfer, porosity, saturated hydraulic conductivity, temperature, seepage
Tipology:1.01 - Original Scientific Article
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2021
Number of pages:Str. 61-75
Numbering:Letn. 34, št. 60
UDC:532.5:676.017.6
ISSN on article:1581-0267
DOI:10.15292/acta.hydro.2021.05 This link opens in a new window
COBISS.SI-ID:70302979 This link opens in a new window
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Downloads:11
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Record is a part of a journal

Title:Acta hydrotechnica
Shortened title:Acta hydrotech.
Publisher:Fakulteta za gradbeništvo in geodezijo
ISSN:1581-0267
COBISS.SI-ID:1838689 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0180
Name:Vodarstvo in geotehnika: orodja in metode za analize in simulacije procesov ter razvoj tehnologij

Secondary language

Language:Slovenian
Title:Vpliv koeficienta prepustnostiin poroznosti zemljin na prenos toplote s precejanjem
Abstract:
Heat transfer within the soil is a complex process in the presence of seepage flow. In such conditions, the soil%s thermal behavior is influenced by the thermal and hydraulic properties of the medium as well as the initial conditions and boundary conditions to which the medium is subjected. This paper presents the experimental and numerical studies of heat transfer within the sand subjected to the seepage flow. It focuses on the influence of saturated hydraulic conductivity and the porosity of medium on the heat transfer process. The temperature distribution within the sand was monitored by the optical fiber Distributed Temperature Sensor (DTS). The experiment was performed on three types of silica-dominated sands with different saturated hydraulic conductivities and different Soil Water Characteristic Curve (SWCC). In addition to the experimental study, a coupled hydrothermal numerical model was designed in FEFLOW software and validated by comparing its results with the experimental measurements. To determine the influence of porosity and saturated hydraulic conductivity on heat transfer, we analyzed the numerical models for different values of porosity and saturated hydraulic conductivity. The numerical and experimental studies showed that the thermal velocity is higher in sand with higher saturated hydraulic conductivity and temperature declination occurs more quickly due to the heat convection process. Saturated sand with larger porosity has an overall higher heat capacity, wherefore the temperature declination started later in the measuring points but dropped down lower close to the temperature of the upstream water.

Keywords:prenos toplote, poroznost, koeficient prepustnosti, temperature, precejanje

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