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Appl. Sci. 2017, 7(2), 153; doi:10.3390/app7020153

Effects of a Nano-Silica Additive on the Rock Erosion Characteristics of a SC-CO2 Jet under Various Operating Conditions

1
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430000, China
2
Hubei Key Laboratory of Water Jet Theory and New Technology, Wuhan University, Wuhan 430000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jose Augusto Paixao Coelho
Received: 6 December 2016 / Revised: 31 January 2017 / Accepted: 3 February 2017 / Published: 8 February 2017
(This article belongs to the Special Issue The Applications of Supercritical Carbon Dioxide)
View Full-Text   |   Download PDF [3495 KB, uploaded 8 February 2017]   |  

Abstract

In order to improve the erosion capacity of a supercritical carbon dioxide (SC-CO2) jet, the influence of a nano-silica additive on the rock erosion characteristics was experimentally investigated. By impinging the SC-CO2 jets with nano-silica mass fractions of 0 wt % (pure SC-CO2 jet), 3 wt %, 6 wt %, 9 wt %, 12 wt %, 15 wt %, and 18 wt % on specimens of red sandstone, the erosion volumes under various operating conditions were measured and analyzed. Results show that an appropriate amount of nano-silica additive can greatly enhance the erosion ability of a SC-CO2 jet. The effect on the erosion ability largely depends on the operating conditions. For instance, when the other conditions are fixed, 6 wt %, 9 wt %, 12 wt %, and 15 wt % were the optimum mass fractions, successively, with the inlet pressure increasing from 30 MPa to 60 MPa. With the increase in ambient pressure, the optimum mass fraction is unchanged under the constant inlet pressure, while it increases under the constant pressure drop. Additionally, the optimum mass fraction decreases when the fluid temperature increases. In addition, the optimal standoff distances are about five times the nozzle diameter of the nano-silica SC-CO2 jet, and three times for the pure jet. This research provides a new method for effectively enhancing the rock erosion performance of a SC-CO2 jet. View Full-Text
Keywords: SC-CO2 jet; nano-silica additive; rock erosion; erosion volume; operating conditions SC-CO2 jet; nano-silica additive; rock erosion; erosion volume; operating conditions
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Huang, M.; Kang, Y.; Long, X.; Wang, X.; Hu, Y.; Li, D.; Zhang, M. Effects of a Nano-Silica Additive on the Rock Erosion Characteristics of a SC-CO2 Jet under Various Operating Conditions. Appl. Sci. 2017, 7, 153.

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