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城市建筑环境下燃气泄漏扩散的数值模拟 被引量:1
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作者 阿克兰 《化工设计通讯》 CAS 2020年第2期189-189,252,共2页
为分析泄漏时间、管道压力、泄漏口与建筑物距离三个因素对街道天然气管道泄漏的影响,采用计算流体力学的方法对天然气管道泄漏扩散进行模拟,得到不同影响因素下的甲烷体积分数分布。研究表明:随着泄漏时间的增加,射流高度的增加,气体... 为分析泄漏时间、管道压力、泄漏口与建筑物距离三个因素对街道天然气管道泄漏的影响,采用计算流体力学的方法对天然气管道泄漏扩散进行模拟,得到不同影响因素下的甲烷体积分数分布。研究表明:随着泄漏时间的增加,射流高度的增加,气体射流速度逐渐减小,甲烷逐渐向四周扩散;泄漏压力对泄漏的影响较大,直接影响扩散范围;建筑物对甲烷体积分数分布和变化产生很大影响,泄漏天然气对旁边的建筑物有贴附效应。 展开更多
关键词 天然气 建筑物 泄漏 数值模拟
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Casimir wormholes inspired by electric charge in Einstein–Gauss–Bonnet gravity
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作者 Mushayydha Farooq M Zubair +1 位作者 ali H Alkhaldi akram ali 《Communications in Theoretical Physics》 CSCD 2024年第12期93-112,共20页
This investigation assesses the feasibility of a traversable wormhole by examining the energy densities associated with charged Casimir phenomena.We focus on the influence of the electromagnetic field created by an el... This investigation assesses the feasibility of a traversable wormhole by examining the energy densities associated with charged Casimir phenomena.We focus on the influence of the electromagnetic field created by an electric charge as well as the negative energy density arising from the Casimir source.We have developed different shape functions by defining energy densities from this combination.This paper explores various configurations of Casimir energy densities,specifically those occurring between parallel plates,cylinders and spheres positioned at specified distances from each other.Furthermore,the impact of the generalized uncertainty principle correction is also examined.The behavior of wormhole conditions is evaluated based on the Gauss–Bonnet coupled parameter(μ)and electric charge(Q)through the electromagnetic energy density constraint.This is attributed to the fact that the electromagnetic field satisfies the characteristicρ=-pr.Subsequently,we examine the active gravitational mass of the generated wormhole geometries and explore the behavior ofμand Q concerning active mass.The embedding representations for all formulated shape functions are examined.Investigations of the complexity factor of the charged Casimir wormhole have demonstrated that the values of the complexity factor consistently fall within a particular range in all scenarios.Finally,using the generalized Tolman–Oppenheimer–Volkoff equation,we examine the stability of the resulting charged Casimir wormhole solutions. 展开更多
关键词 charged casimir wormholes GUP-Corrected casimir wormholes modified gravity
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Traversable wormhole solutions in the f(R)theories of gravity under the Karmarkar condition 被引量:1
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作者 Adnan Malik Fatemah Mofarreh +1 位作者 Aqsa Zia akram ali 《Chinese Physics C》 SCIE CAS CSCD 2022年第9期276-286,共11页
This paper examines traversable wormhole models in the f(R) theories of gravity by applying the Karmarkar condition. For this purpose, we consider spherically symmetric space-time to examine the structure of wormholes... This paper examines traversable wormhole models in the f(R) theories of gravity by applying the Karmarkar condition. For this purpose, we consider spherically symmetric space-time to examine the structure of wormholes. First, we investigate wormholes and their geometry using the redshift function under various conditions. Subsequently, we discuss the embedding diagram of the upper and lower universe using radial coordinates in two and three-dimensional Euclidean affine space. Three exclusive models are considered for the f(R) theories of gravity,and the radial and tangential pressures are observed. Furthermore, by taking a definite shape function, we observe the behavior of energy conditions. We determine that energy conditions are violated, and their violation is generic and represents the presence of exotic matter. According to Einstein’s field theory, the existence of wormholes is predicated on the occurrence of rare material. Hence, we conclude that our study is more realistic and stable. 展开更多
关键词 wormhole geometry Karmarkar condition red shift function energy conditions
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