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triple points and phase transitions of D-dimensional dyonic Ad S black holes with quasitopological electromagnetism in Einstein–Gauss–Bonnet gravity

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Chinese Physics B 2024年第6期33卷 272-287页

作者：牟平辉蒋青权何柯腱李国平 School of Physics and Astronomy China West Normal UniversityNanchong 637000China College of Physics Chongqing UniversityChongqing 401331China

By considering the negative cosmological constant Λ as a thermodynamic pressure, we study the thermodynamics and phase transitions of the D-dimensional dyonic Ad S black holes(BHs) with quasitopological electromagnetism in Einstein–Gauss–Bonnet(EGB) gravity. The results indicate that the small/large BH phase transition that is similar to the van der Waals(vdW) liquid/gas phase transition always exists for any spacetime dimensions. Interestingly, we then find that this BH system exhibits a more complex phase structure in 6-dimensional case that is missed in other ***, it shows for D = 6 that we observed the small/intermediate/large BH phase transitions in a specific parameter region with the triple point naturally appeared. Moreover, when the magnetic charge turned off, we still observed the small/intermediate/large BH phase transitions and triple point only in 6-dimensional spacetime, which is consistent with the previous results. However, for the dyonic Ad S BHs with quasitopological electromagnetism in Einstein–Born–Infeld(EBI) gravity, the novel phase structure composed of two separate coexistence curves observed by Li et al. [Phys. Rev. D105 104048(2022)] disappeared in EGB gravity. This implies that this novel phase structure is closely related to gravity theories, and seems to have nothing to do with the effect of quasitopological electromagnetism. In addition, it is also true that the critical exponents calculated near the critical points possess identical values as mean field theory. Finally, we conclude that these findings shall provide some deep insights into the intriguing thermodynamic properties of the dyonic Ad S BHs with quasitopological electromagnetism in EGB gravity.

关键词： AdS black hole phase transition triple point

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Detonation Propagation in Narrow Gaps with Various Configurations

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Journal of Thermal Science 2007年第3期16卷 283-288页

作者： M.Monwar ynu.ac.jp) Y.Yamamoto K.Ishii T.Tsuboi Department of Mechanical Engineering Yokohama National University79-5 TokiwadaiHodogaya-kuYokohama 240-8501Japan.(Email address:d05sb192

In general all detonation waves have cellular structure formed by the trajectory of the triple points. This paper aims to investigate experimentally the propagation of detonation in narrow gaps for hydrogen-oxygen-argon mixtures in terms of various gap heights and gap widths. The gap of total length 1500 mm was constructed by three pair of stainless plates, each of them was 500 mm in length, which were inserted in a detonation tube. The gap heights were varied from 1.2 mm to 3.0 mm while the gap widths were varied from 10 mm to 40 mm. Various argon dilution rates were tested in the present experiments to change the size of cellular structure. Attempts have been made by means of reaction front velocity, shock front velocity, and smoked foil to record variations of cellular structure inside the gaps. A combination probe composed of a pressure and an ion probe detected the arrival of the shock and the reaction front individually at one measurement point. Experimental results show that the number of the triple points contained in detonation front decreases with decrease in the gap heights and gap widths, which lead to larger cellular structures. For mixtures with low detonability, cell size is affected by a certain gap width although conversely cell size is almost independent of gap width. From the present result it was found that detonation propagation inside the gaps is strongly governed by the gap height and effects of gap width is dependent on detonability of mixtures.

关键词： Detonation cellular structure gap configuration triple point

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Numerical Investigation of the Influence of Fuel Concentration Gradient on Propane/Oxygen Detonation Propagation

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Journal of Thermal Science 2023年第6期32卷 2336-2350页

作者： SHAO Xiaofeng WU Tianxing MENG Qingyang ZHAO Ningbo QI Lei ZHENG Hongtao College of Power and Energy Engineering Harbin Engineering UniversityHarbin150001China College of Power and Energy Engineering Northeast Electric Power UniversityJilin132012China

In this paper,one-and two-dimensional numerical simulations are carried out to study the effects of fuel concentration gradients(such as steep,intermediate and shallow)on the detonation wave *** equivalent ratio range of detonation propagation,the quenching mechanism and the change of cell size are discussed in *** simulation results show,as the fuel concentration gradient increases,the detonation wavefront decays faster and decouples into a leading shock and a following flame at equivalence ratios of 0.68,0.64 and 0.62,***,there are two modes of the quenching *** occurs in the steep gradient that the detonation wave fails *** O_(2)in front of the detonation wave passes through the detonation wave and forms some unburned O_(2)*** unburned pockets are affected by the marginal walls and reduce the heat *** other occurs in the intermediate and shallow gradients that more triple points will survive in the flow field,which leads to a difference in the propagation speed of the detonation *** makes the detonation wavefront bent and *** unburned O_(2)pockets are affected by the strong instability near the triple points and show different distribution characteristics compared with the steep gradient,which may be helpful to the detonation *** addition,as the fuel concentration gradient increases,the triple points moving toward the wall gradually disappear while the triple points that move toward the center can continue to survive,which leads to the gradual increase in cell size and irregularity of the cell structure.

关键词： detonation wave fuel concentration gradient triple point numerical simulation

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Reflection of a moving shock wave over an oblique shock wave

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Chinese Journal of Aeronautics 2021年第5期34卷 399-403页

作者： Miaomiao WANG Ziniu WU Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China

The reflection of a moving shock wave over a wedge immersed in a still gas and the reflection of a wed ge induced steady shock wave over symmetrical and asymmetrical reflecting surfaces have received intensive considerations since more than 70 years *** we consider a different shock reflection problem—reflection of a moving shock wave over an initially steady oblique shock wave induced by a wedge immersed in supersonic *** the flow condition we considered,five moving triple points,with each connecting an incident shock wave,a reflected shock wave and a Mach stem,are *** using the reference frame co-moving with each triple point,the type of each shock wave of this triple point is *** present study is significant in that it treats a new shock reflection problem leading to a new shock reflection configuration and showing potential applications in supersonic flow with unsteady shock interaction.

关键词： Shock reflection triple point Unsteady shock wave

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Rational Double points on a Normal Quintic K3 Surface

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Acta Mathematica Sinica,English Series 1994年第4期10卷 348-361页

作者： Yang Jin-gen Institute of Mathematics Fudan University Shanghai China

This paper displays the relation between the Dynkin diagrams of rational double points on a normal quintic K3 surface with one triple point and the positive definite lattices of rank 16 with discriminant *** certain conditions,the former can be obtained from the Dynkin diagrams of the latter by a succession of two elementary transformations.

关键词： Root System Root Lattice triple point Orthogonal Complement Dynkin Diagram

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Adventures in Melt Casting for Near-net Shape,Sheet Metal Products

Adventures in Melt Casting for Near-net Shape,Sheet Metal Pr...

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2007中国钢铁年会

作者： Roderick I.L.Guthrie Mihaiela Isac McGill Metals Processing Centre 3610 University StreetMcGill UniversityMontreal QuebecCanada H3A 2B2 McGill Metals Processing Centre 3610 University StreetMcGill UniversityMontreal QuebecCanada H3A 2B2

＜正＞The contacting of a liquid metal/alloy with a freezing substmte during twin roll and belt casting operations commonly involves three phases;the contacting liquid metal,the colder substrate/superstrate being contacted,and an intervening gas phase squeezed in between the *** on interfacial chemical reactions,interracial gas flows,meniscus behaviour,substrate topology,metal wetting/spreading characteristics,etc.,strip products can be cast in a satisfactory manner,or *** paper describes a number of interesting experiments that have been devised to further understand the nature and role of interfaces in governing a casting machine’s productivity,sheet surface quality,and as-cast microstructures.

关键词： friction-free casting triple point interfacial phenomena thermal resistance

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