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Numerical simulations of dissolution...

Upadhyay, Virat K.

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Numerical simulations of dissolution in rock fractures and porous rocks.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Numerical simulations of dissolution in rock fractures and porous rocks./
作者:	Upadhyay, Virat K.
面頁冊數:	78 p.
附註:	Source: Dissertation Abstracts International, Volume: 77-09(E), Section: B.
Contained By:	Dissertation Abstracts International77-09B(E).
標題:	Chemical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10102536
ISBN:	9781339662404

Numerical simulations of dissolution in rock fractures and porous rocks.
Upadhyay, Virat K.

Numerical simulations of dissolution in rock fractures and porous rocks. - 78 p.

Source: Dissertation Abstracts International, Volume: 77-09(E), Section: B.

Thesis (Ph.D.)--University of Florida, 2015.

Dissolution of fractured rocks is often accompanied by the formation of highly localized flow paths. While the fluid flow follows existing fractures in the rock, these fissures do not in general open uniformly. Simulations and laboratory experiments have shown that distinct channels or "wormholes" develop within the fracture, from which a single highly localized flow path eventually emerges. These wormholes can be characterized based on their shape, length and spacing between them. The aim of the present work is to investigate how the characteristics of these emerging flow paths are influenced by the initial aperture field. We have simulated the dissolution of a single fracture starting from a spatially correlated aperture distribution. Our results indicate a surprising insensitivity of the evolving dissolution patterns and flow rates to the amplitude and correlation length characterizing the imposed aperture field. We connect the similarity in outcomes to the self-organization of the flow into a small number of wormholes, with the spacing determined by the length of the longest wormholes. We have also investigated the effect of a localized region of increased aperture on the developing dissolution patterns. A competition was observed between the tendency of the high-permeability region to develop the dominant wormhole and the tendency of wormholes to spontaneously nucleate throughout the rest of the fracture. We consider the consequences of these results for the modeling of dissolution in fractured and porous rocks.

ISBN: 9781339662404Subjects--Topical Terms:

560457
Chemical engineering.

Numerical simulations of dissolution in rock fractures and porous rocks.
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500 $a Source: Dissertation Abstracts International, Volume: 77-09(E), Section: B.
500 $a Adviser: Anthony J. C. Ladd.
502 $a Thesis (Ph.D.)--University of Florida, 2015.
520 $a Dissolution of fractured rocks is often accompanied by the formation of highly localized flow paths. While the fluid flow follows existing fractures in the rock, these fissures do not in general open uniformly. Simulations and laboratory experiments have shown that distinct channels or "wormholes" develop within the fracture, from which a single highly localized flow path eventually emerges. These wormholes can be characterized based on their shape, length and spacing between them. The aim of the present work is to investigate how the characteristics of these emerging flow paths are influenced by the initial aperture field. We have simulated the dissolution of a single fracture starting from a spatially correlated aperture distribution. Our results indicate a surprising insensitivity of the evolving dissolution patterns and flow rates to the amplitude and correlation length characterizing the imposed aperture field. We connect the similarity in outcomes to the self-organization of the flow into a small number of wormholes, with the spacing determined by the length of the longest wormholes. We have also investigated the effect of a localized region of increased aperture on the developing dissolution patterns. A competition was observed between the tendency of the high-permeability region to develop the dominant wormhole and the tendency of wormholes to spontaneously nucleate throughout the rest of the fracture. We consider the consequences of these results for the modeling of dissolution in fractured and porous rocks.
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