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Experimental study of polymer flooding in fractured systems using five-spot glass micromodel: The role of fracture geometrical properties
, Article Energy Exploration and Exploitation ; Volume 30, Issue 5 , 2012 , Pages 689-706 ; 01445987 (ISSN) ; Ghazanfari, M ; Kharrat, R ; Sharif University of Technology
SAGE
2012
Abstract
Water flooding is being widely used in the petroleum industry and has been considered as a simple inexpensive secondary recovery method. But in fractured formations, existence of fracture system in reservoir rock induces an adverse effect on oil recovery by water flooding. Polymer flooding has been successfully applied as an alternative enhanced oil recovery method in fractured formations. But, the role of fracture geometrical properties on macroscopic efficiency of polymer flooding is not yet well-understood, especially in fractured five-spot systems. In this work five-spot glass micromodel, because of micro-visibility, ease of multiple experimentations and also presence of the unexplored...
Performance analysis and optimization of high capacity pulse tube refrigerator
, Article ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010, 12 July 2010 through 14 July 2010 ; Volume 1 , 2010 , Pages 257-263 ; 9780791849156 (ISBN) ; Roshanghalb, F ; Jahanbakhshi, R ; Saidi, M. H ; Kazemzadeh Hannani, S ; Sharif University of Technology
Abstract
High capacity pulse tube refrigerator (HCPTR) is a new generation of cryocoolers tailored to provide more than 250 W of cooling power at cryogenic temperatures. The most important characteristics of HCPTR when compared with other types of pulse tube refrigerators are a powerful pressure wave generator, and an accurate design. In this paper the influence of geometrical and operating parameters on the performance of a double inlet pulse tube refrigerator (DIPTR) is studied. The DIPTR is modeled applying the nodal analysis technique, using mass, momentum and energy conservation equations. The model is able to compute instantaneous flow field throughout the system and calculate cooling capacity...