Topic
Countercurrent exchange
About: Countercurrent exchange is a research topic. Over the lifetime, 2255 publications have been published within this topic receiving 28687 citations. The topic is also known as: Countercurrent exchange.
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3 citations
07 Mar 2023
TL;DR: In this article , Liu et al. developed an improved gas migration velocity model in closed well conditions based on the combination of the equation of motion (bubble flow) and Taylor bubble correlation (slug flow).
Abstract:
This study aims to provide the design and calculation method of key parameters in bullheading/PMCD operations. An improved gas migration velocity model in closed well conditions was developed based on the combination of the equation of motion (bubble flow) and Taylor bubble correlation (slug flow). A detailed derivation of the model can be found in our companion work (Liu et al. 2023). Experiments of Taylor bubble countercurrent behavior in an eccentric 6 in. × 4 in. annulus were conducted. Fluid rheology, annulus inclination, and internal pipe rotational speed were varied to provide a clearer understanding of Taylor bubble physics under non-Newtonian countercurrent flow and its implications for effectively managing upward gas migration that can occur in a wellbore during drilling operations in fractured or vugular rock formations. Computational Fluid Dynamics (CFD) simulations were performed to estimate the velocity of Taylor bubble in vertical annuli with downward fluid flow and a new closure relation for distribution parameter, C0, was proposed. The drift flux model embedded in the new gas migration velocity model was applied to simulate the dynamics of bullheading/PMCD. Good agreement between the model and published data was obtained. The effect of different bullheading rates on surface pressure and gas fraction in PMCD operation was examined.
3 citations
3 citations
TL;DR: In this paper, the countercurrent flow limits for an air-water system were obtained for four cases of sphere packings in a 1 m × 34 mm diameter pipe under the same conditions as those encountered in free-flow experiments.
3 citations
Patent•
08 Jun 2017
TL;DR: In this paper, a system and a method for exchanging heat between a fluid (F) and heat storage particles (H) is described, where the exchange zone comprises an exchange zone in which the fluid and the Hs in a fluidized bed flow as a countercurrent flow and a cross flow.
Abstract: The present invention relates to a system and a method for exchanging heat between a fluid (F) and heat storage particles (3). The exchange system comprises an exchange zone (2) in which the fluid (F) and the heat storage particles in a fluidized bed flow as a countercurrent flow and a cross flow. The invention also relates to a compressed gas energy storage and restoration system and method using the heat exchange system.
3 citations