Nonequilibrium condensation process of a holographic superconductor in de Rham-Gabadadze-Tolley massive gravity

2019 ◽  
Vol 100 (4) ◽  
Author(s):  
Ran Li ◽  
Yujia Zhao
Keyword(s):  
Massive Gravity ◽  
Condensation Process ◽  
Holographic Superconductor ◽  
De Rham ◽  
Nonequilibrium Condensation

scholarly journals Thin-shell wormholes in de Rham–Gabadadze–Tolley massive gravity

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
Takol Tangphati ◽  
Auttakit Chatrabhuti ◽  
Daris Samart ◽  
Phongpichit Channuie
Keyword(s):  
Thin Shell ◽  
Correction Term ◽  
Massive Gravity ◽  
Energy Conditions ◽  
Anisotropic Pressure ◽  
Spacetime Geometry ◽  
Classical Energy ◽  
De Rham ◽  
Thin Shell Wormholes ◽  
The Stability

Abstract In this work, we study the thin-shell wormholes in dRGT massive gravity. In order to glue two bulks of the spacetime geometry, we first derive junction conditions of the dRGT spacetime. We obtain the dynamics of the spherical thin-shell wormholes in the dRGT theory. We show that the massive graviton correction term of the dRGT theory in the Einstein equation is represented in terms of the effective anisotropic pressure fluid. However, if there is only this correction term, without invoking exotic fluids, we find that the thin-shell wormholes cannot be stabilized. We then examine the stability conditions of the wormholes by introducing four existing models of the exotic fluids at the throat. In addition, we analyze the energy conditions for the thin-shell wormholes in the dRGT massive gravity by checking the null, weak, and strong conditions at the wormhole throat. We show that in general the classical energy conditions are violated by introducing all existing models of the exotic fluids. Moreover, we quantify the wormhole geometry by using the embedding diagrams to represent a thin-shell wormhole in the dRGT massive gravity.

scholarly journals Non-equilibrium condensation process in a holographic superconductor

2010 ◽  
Vol 2010 (7) ◽  
Author(s):  
Keiju Murata ◽  
Shunichiro Kinoshita ◽  
Norihiro Tanahashi
Keyword(s):  
Condensation Process ◽  
Holographic Superconductor ◽  
Non Equilibrium

Stability Prediction of the Nuclear Turbine Blades During Wet Steam Nonequilibrium Condensation Process

2019 ◽  
Vol 141 (9) ◽  
Author(s):  
Bing Guo ◽  
Weixiao Tang
Keyword(s):  
Turbine Blades ◽  
Condensation Process ◽  
Equivalent Stiffness ◽  
Wet Steam ◽  
Two Phase ◽  
Equivalent Damping ◽  
Novel Method ◽  
Phase Temperature ◽  
Nonequilibrium Condensation ◽  
The Stability

Stability of the nuclear turbine blades is difficult to be accurately predicted because the wet steam load (WSL) as well as its induced equivalent damping and stiffness during nonequilibrium condensation process (NECP) is hard to be directly calculated. Generally, in design, NECP is assumed as equilibrium condensation process (ECP), of which the two-phase temperature difference (PTD) between gaseous and liquid is ignored. In this paper, a novel method to calculate the WSL-induced equivalent damping and equivalent stiffness during NECP based on the combined microperturbation method (MPM) and computational fluid dynamics method (CFDM) was proposed. Once the WSL-induced equivalent damping and equivalent stiffness are determined, the stability of the blade-WSL system, of which the blade was modeled by a pretwisted airfoil cantilever beam, can then be predicted based on the Lyapunov's first method. Besides, to estimate the effects of PTD, comparisons between the WSL-induced equivalent damping and equivalent stiffness as well as the unstable area during NECP and ECP were presented. Results show that the WSL-induced equivalent damping and equivalent stiffness during NECP are more sensitive to the inlet boundary due to the irreversible heat transfer caused by PTD during NECP. Accordingly, the unstable area during NECP is about three times larger than during ECP.

scholarly journals Rotating black strings in de Rham-Gabadadze-Tolley massive gravity

2020 ◽  
Vol 101 (10) ◽  
Author(s):  
Sushant G. Ghosh ◽  
Rahul Kumar ◽  
Lunchakorn Tannukij ◽  
Pitayuth Wongjun
Keyword(s):  
Massive Gravity ◽  
De Rham ◽  
Black Strings

scholarly journals Greybody factor for massive fermion emitted by a black hole in de Rham-Gabadadze-Tolley massive gravity theory

2021 ◽  
Vol 104 (8) ◽  
Author(s):  
P. Boonserm ◽  
C. H. Chen ◽  
T. Ngampitipan ◽  
P. Wongjun
Keyword(s):  
Black Hole ◽  
Massive Gravity ◽  
Gravity Theory ◽  
Massive Fermion ◽  
De Rham

scholarly journals A Novel Dehumidification Strategy to Reduce Liquid Fraction and Condensation Loss in Steam Turbines

Entropy ◽  
2021 ◽  
Vol 23 (9) ◽  
pp. 1225
Author(s):  
Yan Yang ◽  
Haoping Peng ◽  
Chuang Wen
Keyword(s):  
Two Phase Flow ◽  
Liquid Fraction ◽  
Turbine Blades ◽  
Suction Side ◽  
Phase Region ◽  
Condensation Process ◽  
Phase Flow ◽  
Steam Turbines ◽  
Two Phase ◽  
Nonequilibrium Condensation

Massive droplets can be generated to form two-phase flow in steam turbines, leading to erosion issues to the blades and reduces the reliability of the components. A condensing two-phase flow model was developed to assess the flow structure and loss considering the nonequilibrium condensation phenomenon due to the high expansion behaviour in the transonic flow in linear blade cascades. A novel dehumidification strategy was proposed by introducing turbulent disturbances on the suction side. The results show that the Wilson point of the nonequilibrium condensation process was delayed by increasing the inlet superheated level at the entrance of the blade cascade. With an increase in the inlet superheated level of 25 K, the liquid fraction and condensation loss significantly reduced by 79% and 73%, respectively. The newly designed turbine blades not only remarkably kept the liquid phase region away from the blade walls but also significantly reduced 28.1% averaged liquid fraction and 47.5% condensation loss compared to the original geometry. The results provide an insight to understand the formation and evaporation of the condensed droplets inside steam turbines.

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