检索结果-南通市图书馆

A new and reliable model for predicting methane viscosity at high pressures and high temperatures

Journal of Natural Gas Chemistry 2010年第5期19卷 552-556页

作者： Ehsan Heidaryan Jamshid Moghadasi Amir Salarabadi Faculty of Energy Kermanshah University of Technology Petroleum Engineering Department Petroleum University of TechnologyAhwaz 63431Iran Ilam Gas Treating Company

In recent years, there has been an increase of interest in the flow of gases at relatively high pressures and high temperatures. Hydrodynamic calculation of the energy losses in the flow of gases in conduits, as well as through the porous media constituting natural petroleum reservoirs, requires knowledge of the viscosity of the fluid at the pressure and temperature involved. Although there are numerous publications concerning the viscosity of methane at atmospheric pressure, there appears to be little information available relating to the effect of pressure and temperature upon the viscosity. A survey of the literature reveals that the disagreements between published data on the viscosity of methane are common and that most investigations have been conducted over restricted temperature and pressure ranges. Experimental viscosity data for methane are presented for temperatures from 320 to 400 K and pressures from 3000 to 140000 kPa by using falling body viscometer. A summary is given to evaluate the available data for methane, and a comparison is presented for that data common to the experimental range reported in this paper. A new and reliable correlation for methane gas viscosity is presented. Predicted values are given for temperatures up to 400 K and pressures up to 140000 kPa with Average Absolute Percent Relative Error （EABS） of 0.794.

关键词： methane viscosity falling body viscometer high pressures high temperatures correlation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ground-state structure and physical properties of YB_(3) predicted from first-principles calculations

引用

Chinese Physics B 2021年第4期30卷 383-388页

作者： Bin-Hua Chu Yuan Zhao De-Hua Wang School of Physics and Opto-Electronic Engineering Ludong UniversityYantai 264025China

Using the calypso algorithm with first-principles calculations,we have predicted two orthorhombic Cmmm and Pmmm structures for YB_(3).The new structures are energetically much better than the previously proposed WB_(3)-type,ReB_(3)-type,FeB_(3)-type,and TcP3-type *** find that the Cmmm phase transforms to the Pmmm phase at about 31 *** calculations show that the Cmmm phase is mechanical and dynamical stable at ambient *** analysis of the chemical bonding properties indicates that there are strong B-B bonds that make considerable contributions to its stability.

关键词： first-principles high pressures convex hull

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：