Characteristics and Prediction of the Thermal Diffusivity of Sandy Soil

Dai, Baoming; Zhang, Yaxing; Ding, Haifeng; Xu, Yunlong; Liu, Zhiyun

doi:10.3390/en15041524

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…Moreover, the thermal diffusivity of peat-sand mixtures showed initially increasing trend, reaching a plateau and then exhibiting decreasing trend with further increasing of w, this water content is known as threshold water content (TWC) [23]. Moreover, the peak value of thermal diffusivity was found to be increased with γ d and f s in the peat-sand mixtures and observed lowest and highest value for peat and sand respectively, the similar observations also reported by Arkhangelskaya and Luckyashchenko [30,31]. Chen et al [32] have studied the thermal conductivity of bentonite added graphene at different γ d ranging from 1.4 gm/cm 3 to 1.9 gm/cm 3 with the variation of graphene oxide content from 0-50%.…”

Section: Introductionsupporting

confidence: 80%

“…Furthermore, previous studied depict that the capability of storing heat and conducting heat of back ll material in the vicinity of power cable systems, depend upon their thermal conductivity (λ), thermal diffusivity (D) and volumetric heat capacity (C v ), which are collectively refered to as thermophysical parameters [31,53]. The D simply represent that rate of the spread of heat within a conductive medium.…”

Section: Introductionmentioning

confidence: 99%

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Thermophysical Properties of Bentonite–Sand/Fly Ash-Based Backfill Materials for Underground Power Cable

2023

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The surrounding (back ll) materials around the underground power cable systems are essential for dissipiating the heat away from it, during the exertion phases. The heat dissipiation restrains the thermal instability and risk of progressive drying of the back ll materials, thus, reduce thermal stress on power cable. Thermal instability is the reduction of thermal properties (conductivity or diffusivity) due to migration of moisture because of heat accumulation. Thus, the back ll materials should have adequate thermal properties and favorable water retention capacity, which will falicitate the heat transfer easily from the heat source to the surrounding area with minimal moisture migration. The bentonite have high water retention capacity, but low thermal conductivity. Sand/ y ash exhibit low water retention and have higher thermal conductivity than bentonite. The addition of bentonite promote the water holding capacity and thermo-physical properties of sand and y ash. Therefore, this study presents the thermal properties of back ll materials, bentonite-y ash (B-F) and bentonite-sand (B-S) at varying weigth-percent of sand and y ash with bentonite. various compositions of the mixtures were compacted to varying dry densities and water contents and thermal properties variation of back ll materials were measured using a dual thermal needle probe 'KD2 Pro 2008' at room temperature. The study deals with systematic evaluation of the volumetric speci c heat capacity, thermal conductivity and diffusivity of back ll materials against varying dry density and water content. The threshold water content (TWC) has been determined from the thermal diffusivity-water content variation curve and it has correlated with plastic limit (PL) and optimum mosite conetn (OMC). Thereafter, the e cacy two thermal conductivity prediction models also were statistically evaluated with respect to experimental results.

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Section: Introductionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Thermophysical Properties of Bentonite–Sand/Fly Ash-Based Backfill Materials for Underground Power Cable

2023

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“…Specifically, Ref. [78] found diffusivity for sandy soil in Qinghai-Tibet, China, to range from 0.117 × 10 −6 m 2 s −1 to 0.826 × 10 −6 m 2 s −1 . Likewise, Ref.…”

Section: Discussionmentioning

confidence: 99%

Thermal Properties and Temporal Dynamics of Red Latosol (Oxisol) in Sustainable Agriculture and Environmental Conservation

Jordan,

Santos,

Freitas

et al. 2023

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Understanding and characterizing the relationship between soil and environmental temperatures is crucial for developing effective agricultural management strategies, promoting natural resource conservation, and developing sustainable production systems. Despite the direct impact of the thermal properties of Oxisols on global food production and sustainable agriculture, there is a dearth of research in this area. Therefore, this study aimed to monitor and analyze the thermal behavior of a Red Latosol (Oxisol) in Dracena-SP, Brazil, over two years (from 28 July 2020 to 27 July 2022). Using R software (version 4.3.0) and paired group comparisons, we organized the data into twelve-month sets to estimate monthly soil thermal diffusivity using amplitude, arctangent, and logarithm methods. Soil depth and thermal amplitude showed a temporal pattern characterized by inversely proportional magnitudes that followed an exponential behavior. The thermal amplitude of the Oxisol evaluated decreased with increasing depth, indicating soil thermal damping. In conclusion, the relationship between Oxisol and environmental temperature has significant implications for achieving sustainable agriculture and efficient water and plant resource management.

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“…Soil thermal properties are dynamic and are affected by the type of tillage system, soil water content, and soil bulk density (Dec et al., 2009). Tillage can influence α values by affecting soil organic matter, moisture content, bulk density, and aggregate formation and stability (Dai et al., 2022). In comparison to a tilled soil, a no‐till soil had 20%–25% larger α values in the 5‐ to 15‐cm layer (Johnson & Lowery, 1985) and 37% larger α values in the 5‐ to 25‐cm layer (Abu‐Hamdeh, 2000).…”

Section: Introductionmentioning

confidence: 99%

Variability of soil thermal diffusivity in three Iowa fields

Nassar,

Abdallah,

Horton

2023

Soil Science Soc of Amer J

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Soil thermal properties influence the rates of chemical and biological reactions in the soil, seed germination, crop establishment, and productivity. Soil temperature varies with time and depth, and thermal diffusivity (α) is the main property associated with soil temperature variations. Variations in α within row‐cropped fields under long‐term tillage practices are not well documented in Iowa fields. The objective of this study is to determine α variations within three central Iowa fields under long‐term tillage practices and to estimate the required number of measurement sites within each field to determine α at a specified precision. Each field receives different tillage operations; one field is fall moldboard plowed followed by spring disking (MP), another field is fall chisel plowed followed by spring disking (CP), and the third field is ridge no‐tilled slot planted (RN). Thermocouples are used to measure soil temperature at two depths, i.e., 1‐ and 10 cm, at 49 locations (49 grid locations; 1.5×3 m) in each the of three adjacent fields. After allowing the thermocouples to equilibrate with the soil environment for two weeks in each field, hourly 1‐ and 10 cm depth soil temperature observations were recorded for a separate 24‐hour period in each field following rainfall events. Soil temperature measurements with the amplitude and phase equations were analyzed, and 49 α values were determined in each field. The larger the bulk density, the larger the thermal diffusivity. MP had the largest α values, while CP had the smallest values. The mean and standard deviation values for α in the MP, CP, and RN fields were 23±4.8, 13±2.2, and 21±4.0 cm2 h−1, respectively. The coefficients of variation, CV, were similar for the three fields, ranging from 17–21%. The minimum number of samples needed to obtain a confidence interval of 7 cm2 h−1 for α were 2, 5, and 7, respectively, for the CP, RN, and MP fields. The MP field had the largest mean α value and required the largest number of samples to determine α at a specified precision.This article is protected by copyright. All rights reserved

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Characteristics and Prediction of the Thermal Diffusivity of Sandy Soil

Cited by 7 publications

References 9 publications

Thermophysical Properties of Bentonite–Sand/Fly Ash-Based Backfill Materials for Underground Power Cable

Thermophysical Properties of Bentonite–Sand/Fly Ash-Based Backfill Materials for Underground Power Cable

Thermal Properties and Temporal Dynamics of Red Latosol (Oxisol) in Sustainable Agriculture and Environmental Conservation

Variability of soil thermal diffusivity in three Iowa fields

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