Scale effect on hydraulic conductivity and solute transport: Small and large-scale laboratory experiments and field experiments

Godoy, Vanessa A.; Zuquette, Lázaro Valentin; Gómez‐Hernández, J. Jaime

doi:10.1016/j.enggeo.2018.06.020

Cited by 22 publications

(11 citation statements)

References 51 publications

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“…Other than the above-reported cases, to the best of the authors' knowledge, there is no systematic investigation of this problem in the literature. The same issue occurs not only with thermal energy storage but also within heat transfer and fluid flow fields [20]. Nonetheless, the scale effect plays a significant role in moving from lab experiments towards system design.…”

Section: Introductionmentioning

confidence: 98%

A New Methodological Approach for the Evaluation of Scaling Up a Latent Storage Module for Integration in Heat Pumps

et al. 2021

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A clear gap was identified in the literature regarding the in-depth evaluation of scaling up thermal energy storage components. To cover such a gap, a new methodological approach was developed and applied to a novel latent thermal energy storage module. The purpose of this paper is to identify some key aspects to be considered when scaling up the module from lab-scale to full-scale using different performance indicators calculated in both charge and discharge. Different normalization methods were applied to allow an appropriate comparison of the results at both scales. As a result of the scaling up, the theoretical energy storage capacity increases by 52% and 145%, the average charging power increases by 21% and 94%, while the average discharging power decreases by 16% but increases by 36% when mass and volume normalization methods are used, respectively. When normalization by the surface area of heat transfer is used, all of the above performance indicators decrease, especially the average discharging power, which decreases by 49%. Moreover, energy performance in charge and discharge decreases by 17% and 15%, respectively. However, efficiencies related to charging, discharging, and round-trip processes are practically not affected by the scaling up.

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Section: Introductionmentioning

confidence: 98%

A New Methodological Approach for the Evaluation of Scaling Up a Latent Storage Module for Integration in Heat Pumps

et al. 2021

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“…The scale effect on K has been the subject of many studies in the last decades (e.g., Smith et al, 2016;Yang et al, 2018;Godoy et al, 2018), although some authors suggested that the differences found when estimating K using diverse measurement scales may be caused by interpretation errors and inadequate procedures when performing the tests (Butler and Healey, 1998;Lee and Lee, 1999). Most investigations reported an increase in K when increasing the measurement scale (Schulze-Makuch and Cherkauer, 1999;Martínez-Landa and Carrera, 2005;Hunt, 2006;Fallico et al, 2010;Piña et al, 2019;Yu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Comparison of saturated hydraulic conductivity estimated by empirical, hydraulic and numerical modelling methods at different scales in a coastal sand aquifer in Northern Ireland

Águila

McDonnell

Flynn

et al. 2022

Preprint

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Hydraulic conductivity (K) is one of the most challenging hydrogeological properties to appropriately measure due to its dependence on the measurement scale and the influence of heterogeneity. This paper presents a comparison of saturated hydraulic conductivities determined for a quasi-homogeneous coastal sand aquifer, estimated using eight different methodologies, encompassing empirical, hydraulic and numerical modelling methods. The geometric means of K, determined using 22 methods, spanning measurement scales varying between 0.01 m and 100 m, ranged between 3.6 and 58.3 m/d. K estimates from Cone Penetration Test (CPT) data proved wider than those obtained using the other methods, while various empirical equations, commonly used to estimate K from grain-size analysis and Tide-Aquifer interaction techniques revealed variations of up to one order of magnitude. Single-well tracer dilution tests provided an alternative for making preliminary estimates of K when hydraulic gradients were known. Estimates from the slug tests proved between 1.2 and 1.6 times larger than those determined from pumping tests which, with one of the smallest ranges of variation, provided a representative average K of the aquifer as revealed by numerical modelling. By contrast, variations in K with depth could be detected at small scales (~0.1 m). Hydraulic Profiling Tool (HPT) system data indicated that K decreases with depth, which was supported by the numerical model results. No scale effect on K was apparent when considering the ensemble of results, suggesting that hydraulic conductivity estimates do not depend on the scale of measurement in the absence of significant aquifer heterogeneities.

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“…The increase of rainwater in the dam body will cause the unsaturated tailings above the original diving line to gradually enter the saturated state or even the supersaturated state [32]. They are resulting in the gradual decrease and disappearance of the capillary force generated by matric suction acting on the particles, finally reducing the strength of tailings [33]. At the same time, unsteady seepage of rainwater will lead to the migration of fine particles in sandy soil and the tiny particles block the space between the coarse particle [34,35].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Permeability Coefficient in Layered Fine Tailings under Seepage Condition

et al. 2021

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Nearly half of the tailings dams in China are in a state of high-security risks and overservice, and the safety of these tailings dams has always been a concern for relevant scholars. The seepage characteristics of tailings are one of the essential factors affecting the safety of tailings dam. Now, due to the improvement of mineral processing technology, there are many fine tailings dam; the study of the seepage characteristics of the tailings dam is no longer applicable. Fine-grained tailings form uneven deposition in these tailings dams, resulting in the permeability of tailings not conforming to the previous law. Therefore, it is of great significance to study the permeability of fine-grained tailings with uneven deposition. In this paper, the physical model of the simulated tailings dam is established to study the influence of the dry beach slope on the distribution and deposition law of fine tailings during discharge. The test results show that the average particle size of tailings decreases along the length of dry beach, showing the phenomenon of coarsening upstream and thinning downstream. Then, based on the data of fine tailings deposition, the variation characteristics of the permeability coefficient of layered tailings under stable and unstable seepage conditions are studied. The test results show that the variation process of tailings permeability coefficient can be divided into four stages: rapid compaction stage, slow compaction stage, failure stage, and stable stage. Under stable and unstable seepage conditions, the permeability coefficients of unstratified tailing sand are about 10% and 15% higher, respectively, than those in the initial state. The permeability coefficient of layered tailings formed by uneven settlement changes more obviously, which is about 12% and 20% higher than the initial state.

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Scale effect on hydraulic conductivity and solute transport: Small and large-scale laboratory experiments and field experiments

Cited by 22 publications

References 51 publications

A New Methodological Approach for the Evaluation of Scaling Up a Latent Storage Module for Integration in Heat Pumps

A New Methodological Approach for the Evaluation of Scaling Up a Latent Storage Module for Integration in Heat Pumps

Comparison of saturated hydraulic conductivity estimated by empirical, hydraulic and numerical modelling methods at different scales in a coastal sand aquifer in Northern Ireland

Experimental Study on Permeability Coefficient in Layered Fine Tailings under Seepage Condition

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