کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8906479 | 1634413 | 2018 | 38 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sensitivity analysis of temperature changes for determining thermal properties of partially frozen soil with a dual probe heat pulse sensor
ترجمه فارسی عنوان
تجزیه و تحلیل حساسیت تغییرات دما برای تعیین خصوصیات حرارتی خاک خاک منجمد با یک سنسور پالس گرما دوگانه پروب
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی
Determining thermal conductivity (λ) and volumetric heat capacity (C) of partially frozen soils with a dual probe heat pulse (DPHP) sensor is challenging because an applied heat pulse melts ice surrounding the heater probe. Examining DPHP temperature changes with a commonly-used analytical solution that only accounts for heat conduction leads to inaccurate λ and C estimates for partially frozen soils at temperatures between â5â¯Â°C and 0â¯Â°C. In order to determine λ and C accurately and simultaneously, it is necessary to understand how various properties of partially frozen soil influence the temperature changes produced by DPHP sensors. The objective of this study is to determine the sensitivity of DPHP temperature changes to soil conditions and soil thermal properties. A numerical solution for radial heat conduction with soil freezing and thawing is developed. A series of simulations are performed, in which various errors are imposed onto a selected model parameter while other model parameters are held constant, and sensitivity coefficient values (Ï) of the time of maximum probe temperature (tm) and of the maximum probe temperature rise (Tm) for each parameter are calculated. Temperature changes at the measurement probe are quite sensitive to initial soil temperature (Ï values for tm and for Tm are â0.99 and 0.99, respectively), λ (Ï value for tm is â0.93), and parameters determining the shape of the soil freezing characteristic (FC) curve, i.e., saturated water content θs (Ï values for tm and for Tm are 0.59 and â0.73, respectively) and n (Ï values for tm and for Tm are â2.7 and 2.4, respectively). Temperature changes are not very sensitive to C (Ï values for tm and for Tm are 0.034 and â0.15, respectively). Although previous investigations tried to determine C by inverse analysis, this sensitivity analysis shows that the influence of C on temperature response to a heat pulse is masked by that of the FC. Thus, λ and FC parameters are the best candidate parameters to be determined by inverse analysis of DPHP data. This new result will guide further testing of DPHP sensors in partially frozen soils.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cold Regions Science and Technology - Volume 151, July 2018, Pages 188-195
Journal: Cold Regions Science and Technology - Volume 151, July 2018, Pages 188-195
نویسندگان
Yuki Kojima, Joshua L. Heitman, Kosuke Noborio, Tusheng Ren, Robert Horton,