Laboratory techniques to evaluate thermal conductivity for some soils

Nusier, Osama K.; Abu-Hamdeh, Nidal H.

doi:10.1007/s00231-002-0295-x

Cited by 48 publications

(19 citation statements)

References 14 publications

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“…Campbell et al (1991) used a sensor with a probe radius of 0.407 mm. In later work, sensors with a probe radius of 0.635 mm have been used extensively (e.g., Tarara and Ham, 1997;Ren et al, 1999;Basinger et al, 2003), and results have been reported for sensors with a probe radius as large as 1.0 mm (Nusier and Abu-Hamdeh, 2003).…”

mentioning

confidence: 99%

Semianalytical Solution for Dual‐Probe Heat‐Pulse Applications that Accounts for Probe Radius and Heat Capacity

Knight

Kluitenberg

Kamai

et al. 2012

Vadose Zone Journal

139

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The dual‐probe heat‐pulse (DPHP) method is useful for measuring soil thermal properties. Measurements are made with a sensor that has two parallel cylindrical probes: one for introducing a pulse of heat into the soil (heater probe) and one for measuring change in temperature (temperature probe). We present a semianalytical solution that accounts for the finite radius and finite heat capacity of the heater and temperature probes. A closed‐form expression for the Laplace transform of the solution is obtained by considering the probes to be cylindrical perfect conductors. The Laplace‐domain solution is inverted numerically. For the case where both probes have the same radius and heat capacity, we show that their finite properties have equal influence on the heat‐pulse signal received by the temperature probe. The finite radius of the probes causes the heat‐pulse signal to arrive earlier in time. This time shift increases in magnitude as the probe radius increases. The effect of the finite heat capacity of the probes depends on the ratio of the heat capacity of the probes (C0) and the heat capacity of the soil (C). Compared with the case where C0/C = 1, the magnitude of the heat‐pulse signal decreases (i.e., smaller change in temperature) and the maximum temperature rise occurs later when C0/C > 1. When C0/C < 1, the magnitude of the signal increases and the maximum temperature rise occurs earlier. The semianalytical solution is appropriate for use in DPHP applications where the ratio of probe radius (a0) and probe spacing (L) satisfies the condition that a0/L ≤ 0.11.

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mentioning

confidence: 99%

Semianalytical Solution for Dual‐Probe Heat‐Pulse Applications that Accounts for Probe Radius and Heat Capacity

Knight

Kluitenberg

Kamai

et al. 2012

Vadose Zone Journal

139

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“…If the furnace heat were more slowly transferred to the clayey samples, by lower thermal conductivity, curves similar to those obtained could be expected, with an enlargement of the initial band and a shift of the second band for higher temperatures. In fact, according to Nusier and Abu-Hamedeh (2003), samples of sandy soils they assessed showed thermal conductivities ranging from 1.9 to 2.7 times higher than clayey samples, which could explain the observed results.…”

Section: Results and Discussion Calibration Curves Linearity And Matmentioning

confidence: 83%

Mercury Quantification in Soils Using Thermal Desorption and Atomic Absorption Spectrometry: Proposal for an Alternative Method of Analysis

Soares

Filho

Windmöller

et al. 2015

Rev. Bras. Ciênc. Solo

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Despite the considerable environmental importance of mercury (hg), given its high toxicity and ability to contaminate large areas via atmospheric deposition, little is known about its activity in soils, especially tropical soils, in comparison with other heavy metals. this lack of information about hg arises because analytical methods for determination of hg are more laborious and expensive compared to methods for other heavy metals. the situation is even more precarious regarding speciation of hg in soils since sequential extraction methods are also inefficient for this metal. The aim of this paper is to present a technique of thermal desorption associated with atomic absorption spectrometry, TDAAS, as an efficient tool for quantitative determination of hg in soils. the method consists of the release of hg by heating, followed by its quantification by atomic absorption spectrometry. It was developed by constructing calibration curves in different soil samples based on increasing volumes of standard hg 2+ solutions. Performance, accuracy, precision, and quantification and detection limit parameters were evaluated. No matrix interference was detected. Certified reference samples and comparison with a Direct Mercury analyzer, DMa (another highly recognized technique), were used in validation of the method, which proved to be accurate and precise.

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“…The sharp dependence on temperature of the PCP remaining in the sandy soil is also determined by the gas/solid equilibrium of PCP molecules on the surface of particles and heat transfer of the soil, which is defined as effective thermal conductivity, effective diffusivity and bed thickness [35]. Due to the higher thermal conductivity of sandy soil in comparison to other soils, such as loam [36], increasing the temperature enhances the heat transfer inside the soil bed, which results in the establishment of a gas/solid equilibrium quickly as the pollutant diffuses from the internal bed to the soil surface.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the degradation of pentachlorophenol in sandy soil via low-temperature pyrolysis

Thuan

Chang

2012

Journal of Hazardous Materials

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Laboratory techniques to evaluate thermal conductivity for some soils

Cited by 48 publications

References 14 publications

Semianalytical Solution for Dual‐Probe Heat‐Pulse Applications that Accounts for Probe Radius and Heat Capacity

Semianalytical Solution for Dual‐Probe Heat‐Pulse Applications that Accounts for Probe Radius and Heat Capacity

Mercury Quantification in Soils Using Thermal Desorption and Atomic Absorption Spectrometry: Proposal for an Alternative Method of Analysis

Investigation of the degradation of pentachlorophenol in sandy soil via low-temperature pyrolysis

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