IF 1.7 4区工程技术

Shock Waves Pub Date : 2025-04-28 DOI: 10.1007/s00193-024-01205-1

A. Yamamoto, M. Tamagawa

{"title":"Generation and control of underwater microshock waves and microbubbles by a femtosecond pulse laser","authors":"A. Yamamoto, M. Tamagawa","doi":"10.1007/s00193-024-01205-1","DOIUrl":"10.1007/s00193-024-01205-1","url":null,"abstract":"<div><p>This paper describes the generation and control of underwater microshock waves and microbubbles by a femtosecond pulse laser for regenerative medicine applications. To achieve local stimulation of individual cells in this field, it is essential to generate and control microshock waves at the same scale as cells. Consequently, the use of femtosecond pulse lasers has been suggested by researchers due to their noninvasive nature when generating microshock waves. However, the characteristics and control methods of microshock waves and microbubbles have not been sufficiently investigated. In this research, the laser-induced microshock waves were generated by a femtosecond laser with a pulse duration of 260 fs and a pulse energy of <span>(2.1,upmu hbox {J})</span>. First, pressure measurements of the shock waves were carried out, and their overpressure was found to exceed 0.3 MPa at a distance of <span>(300,upmu hbox {m})</span> from the laser focal area. Second, the generation and behavior of microbubbles were successfully observed by optical measurements. A single bubble was generated when the femtosecond pulse laser was focused into water, and it subsequently expanded and contracted according to the Rayleigh–Plesset equation. In addition, its initial behavior was observed, and a comparison between optical measurements and high-speed images revealed that the shock waves were generated 200 ns after the laser has focused.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"35 3","pages":"205 - 213"},"PeriodicalIF":1.7,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic shock wave investigations for an unsteady supersonic flow with a morphing bump over a flat plate 非定常超音速平板上变形凹凸流的动态激波研究

IF 1.7 4区工程技术

Shock Waves Pub Date : 2025-04-12 DOI: 10.1007/s00193-025-01218-4

A. A. Hamada, L. Margha, M. M. AbdelRahman, A. Guaily

{"title":"Dynamic shock wave investigations for an unsteady supersonic flow with a morphing bump over a flat plate","authors":"A. A. Hamada, L. Margha, M. M. AbdelRahman, A. Guaily","doi":"10.1007/s00193-025-01218-4","DOIUrl":"10.1007/s00193-025-01218-4","url":null,"abstract":"<div><p>This study investigates the transient phase of the morphing shock control bump (SCB) over a flat plate using various velocities and accelerations. Specifically, five morphing profiles are tested, namely linear, parabolic, half-parabolic, reversed parabolic, and half-reversed parabolic morphing. The objective of this research is to numerically determine the optimal velocity profile, out of the tested ones, that reduces entropy losses, lag effect, and response time while presenting a dynamic shock system map. The simulations were conducted to solve the 2D supersonic unsteady flow with different free-stream Mach numbers (<span>(M_{infty })</span>). The Reynolds number <span>(textrm{Re}_{infty }=6.6 times 10^7)</span> based on the bump’s length is used. The investigation is achieved by comparing the lag effect, entropy losses, and time response. The study results indicate that the optimal speed to morph with is the one that results in neither a remarkable lag effect in the shock system nor high losses in the entropy deviation from the stationary steady-state case. Additionally, the reversed parabolic motion is the most suitable profile due to its short response time, small lag effect, and low losses. This is because the generated shock system from the appearance of SCB is initially weak, allowing for relatively fast motion. However, near the end of the morphing process, the opposite occurs, requiring relatively slow motion.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"35 3","pages":"215 - 233"},"PeriodicalIF":1.7,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impulsive force measurement by fast response pressure-sensitive paint during shock wave passage 用快速响应压敏涂料测量激波通过时的冲激力

IF 1.7 4区工程技术

Shock Waves Pub Date : 2025-03-24 DOI: 10.1007/s00193-025-01221-9

T. Ikami, J. Abe, S. Tamakuma, S. Takahashi, H. Nagai

{"title":"Impulsive force measurement by fast response pressure-sensitive paint during shock wave passage","authors":"T. Ikami, J. Abe, S. Tamakuma, S. Takahashi, H. Nagai","doi":"10.1007/s00193-025-01221-9","DOIUrl":"10.1007/s00193-025-01221-9","url":null,"abstract":"<div><p>The interaction between a shock wave and an object causes an impulsive force on the object that lasts for a very short time on the order of milliseconds. This study proposes impulsive force measurements using anodized aluminum pressure-sensitive paint (AA-PSP), which is an optical pressure measurement technique. The response time of AA-PSP is on the order of microseconds, indicating the potential for fast pressure drag measurements by integrating the pressure distribution on the surface. In this study, at first, the response time of the fabricated AA-PSP is measured and determined to be <span>(3.3~upmu hbox {s})</span>. A cylindrical model coated with the AA-PSP is installed at the outlet of a shock tube, and the surface pressure is measured in order to calculate the pressure drag with a time resolution of <span>(10~upmu hbox {s})</span>. The experimental results are compared with an Euler CFD simulation computed using an in-house code. The maximum pressure drag in the numerical result exceeds that in the experimental result; however, the maximum pressure drag timings are in good quantitative agreement. In addition to measuring the impulsive force, the AA-PSP results allow for the visualization of complex flow phenomena, such as diffraction and decay in the shock wave strength. This simultaneous measurement of the flow field and impulsive forces can deepen the understanding of the relationship between them.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"35 3","pages":"191 - 204"},"PeriodicalIF":1.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00193-025-01221-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Shock wave amplification and shock-to-detonation transition in a two-phase mixture of liquid triethylaluminum with superheated steam 液体三乙基铝与过热蒸汽两相混合物中的激波放大和激波-爆轰过渡

IF 1.7 4区工程技术

Shock Waves Pub Date : 2025-03-12 DOI: 10.1007/s00193-025-01219-3

S. M. Frolov, I. O. Shamshin, K. A. Byrdin, K. A. Avdeev, V. S. Aksenov, P. A. Storozhenko, S. L. Guseinov

{"title":"Shock wave amplification and shock-to-detonation transition in a two-phase mixture of liquid triethylaluminum with superheated steam","authors":"S. M. Frolov, I. O. Shamshin, K. A. Byrdin, K. A. Avdeev, V. S. Aksenov, P. A. Storozhenko, S. L. Guseinov","doi":"10.1007/s00193-025-01219-3","DOIUrl":"10.1007/s00193-025-01219-3","url":null,"abstract":"<div><p>The paper presents the experimental proof of shock wave amplification and shock-to-detonation transition (SDT) in a two-phase mixture of liquid triethylaluminum (TEA, <span>(hbox {Al}(hbox {C}_{2}hbox {H}_{5})_{3}))</span>—a pyrophoric material reacting with water—and superheated steam in a shock tube. Fine synchronization of TEA injection in the flow of superheated steam with the arrival of a decaying shock wave is shown to change the shock wave dynamics from attenuation to amplification followed by propagation with a nearly constant velocity of 1500–1700 m/s (at a small dose of TEA injection) and 2000–2300 m/s (at a large dose of TEA injection) in a tube during a certain time interval. These speed levels are consistent with the thermodynamic calculations for the detonation speed in the fuel-lean and near-stoichiometric TEA–superheated steam mixtures, respectively. With the small dose of TEA injection, the pressure profiles recorded in the experiments do not generally correspond to the pressure profiles relevant to detonation waves, whereas with the large dose of TEA injection, the pressure profiles resemble those for detonation waves.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"35 3","pages":"235 - 247"},"PeriodicalIF":1.7,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Post-shock flow in micro-channels: a numerical investigation and analysis 微通道中的后冲击流：数值研究与分析

IF 1.7 4区工程技术

Shock Waves Pub Date : 2025-02-20 DOI: 10.1007/s00193-024-01214-0

S. Lokhande, A. Deshpande

引用次数: 0

Temperature rise and pressure dynamics in the early stages of Hartmann–Sprenger tube operation Hartmann-Sprenger管操作初期的温升和压力动态

IF 1.7 4区工程技术

Shock Waves Pub Date : 2025-02-13 DOI: 10.1007/s00193-024-01211-3

Y. Kudo, S. Sawada, N. Itouyama, K. Matsuoka, J. Kasahara

{"title":"Temperature rise and pressure dynamics in the early stages of Hartmann–Sprenger tube operation","authors":"Y. Kudo, S. Sawada, N. Itouyama, K. Matsuoka, J. Kasahara","doi":"10.1007/s00193-024-01211-3","DOIUrl":"10.1007/s00193-024-01211-3","url":null,"abstract":"<div><p>In this study, we focus on the early stages of the Hartmann–Sprenger tube operation in the jet regurgitant mode to investigate three key relationships: (1) between the nozzle dynamic pressure and the start time of temperature rise at the resonance tube end, (2) between the nozzle dynamic pressure and the resonance tube end pressure, and (3) between the distance <i>l</i> from the resonance tube end to the contact surface and the rise in the end gas temperature of the resonance tube. The results showed that the condition for the rise in the resonance tube end gas temperature after the gas jet from the nozzle reached sonic flow was the stabilization of the average fluctuation pressure value at the resonance tube end in conjunction with the nozzle dynamic pressure. At the time of operation stabilization of the Hartmann–Sprenger tube, the average fluctuation pressure at the resonance tube end converged to a constant value almost equal to the nozzle dynamic pressure. This result means that the nozzle dynamic pressure is almost equivalent to the fluctuation pressure at the resonance tube end. Moreover, the distance <i>l</i> did not significantly increase with the resonance tube length <i>L</i> and remained nearly constant. The gas temperature at the resonance tube end obtained from the experimental results generally agreed with the temperature calculated from compression through an adiabatic and isentropic process from <i>L</i> to <i>l</i>.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"35 2","pages":"169 - 184"},"PeriodicalIF":1.7,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00193-024-01211-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143564313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Particle and fluid time scales in a spherical multiphase blast flow 球形多相爆炸流中的粒子和流体时间尺度

IF 1.7 4区工程技术

Shock Waves Pub Date : 2025-02-03 DOI: 10.1007/s00193-024-01207-z

T. Farrukh, R. Houim, D. Guildenbecher, M. Welliver, S. Balachandar

{"title":"Particle and fluid time scales in a spherical multiphase blast flow","authors":"T. Farrukh, R. Houim, D. Guildenbecher, M. Welliver, S. Balachandar","doi":"10.1007/s00193-024-01207-z","DOIUrl":"10.1007/s00193-024-01207-z","url":null,"abstract":"<div><p>The explosive dispersal of particles is an important problem in multiphase physics and is of considerable interest due to its many applications. Simulations that examine particulate dispersal in such flows have employed a variety of methods, including Euler–Lagrange, Euler–Euler, and dusty gas. The appropriate choice of methodology depends on the balance between accuracy and computational cost. In general, if the particles are very small and tracer-like, a cheaper dusty gas approach will be sufficient. In this paper, we present a series of two-dimensional numerical simulations investigating particle and fluid time scales in the context of the explosive dispersal of particles within a spherical shock-tube problem. Using the timescales, the appropriateness of the equilibrium Eulerian approach in calculating the particle velocity is investigated. With increasing particle inertia, the equilibrium Eulerian approximation offers a good compromise between accuracy and computational efficiency, where the particle velocity becomes an algebraic function of the fluid velocity, acceleration, and particle time scale. Different blast parameters, for which the calculation of particle velocity based solely on the flow acceleration and particle time scale is valid, were studied and presented. Initial particle size, volume fraction, blast pressure, and temperature ratio were varied, and the resulting effects on the particle time scale, fluid time scale, and the Stokes number are presented. It was found that the Stokes number is a valid predictor of the viability of the equilibrium Eulerian approximation. For values of the Stokes number below unity, there was good agreement between the equilibrium Eulerian and the Euler–Euler methods. It was observed that the most significant factor impacting the Stokes number, and consequently, the accuracy of the equilibrium Eulerian approximation, is the particle size.\u0000</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"35 1","pages":"57 - 75"},"PeriodicalIF":1.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of methane addition to hydrogen–air mixtures on the transition to detonation due to shock wave focusing in a (90^{circ }) wedge 氢气-空气混合物中加入甲烷对(90^{circ })楔形激波聚焦致爆轰过渡的影响

IF 1.7 4区工程技术

Shock Waves Pub Date : 2025-02-01 DOI: 10.1007/s00193-025-01217-5

S. Khair Allah, W. Rudy, A. Teodorczyk

{"title":"Effect of methane addition to hydrogen–air mixtures on the transition to detonation due to shock wave focusing in a (90^{circ }) wedge","authors":"S. Khair Allah, W. Rudy, A. Teodorczyk","doi":"10.1007/s00193-025-01217-5","DOIUrl":"10.1007/s00193-025-01217-5","url":null,"abstract":"<div><p>This work presents the experimental investigation of the influence of methane addition to <span>({hbox {CH}}_{{4}})</span>–<span>(hbox {H}_{{2}})</span>–air mixture (<span>(varphi = 0.8)</span>–1.6) on the critical conditions for transition to detonation in a <span>(90^{circ })</span> wedge. Similar to <span>(hbox {H}_{{2}})</span>–air mixtures investigated previously, for <span>({hbox {CH}}_{{4}})</span>–<span>({hbox {H}}_{{2}})</span>–air mixtures results showed three ignition modes: (i) flame ignition with ignition delay time longer than 1 µs, (ii) strong ignition with instantaneous transition to detonation, and (iii) weak ignition with delayed transition to detonation. In a stoichiometric mixture with 5% <span>({hbox {CH}}_{{4}})</span> (i.e., 95% <span>({hbox {H}}_{{2}})</span> in fuel), the transition to detonation corresponds to a shock velocity of roughly 752 m/s (an increase of 37 m/s from that obtained in <span>(hbox {H}_{{2}})</span>–air) corresponding to <span>(M = 1.89)</span>. In general, 5% <span>(hbox {CH}_{{4}})</span> addition caused an increase of 3.25–5.03% in the critical shock wave velocity necessary for transition to detonation for all lean and rich mixtures considered. Also, similar to that found for <span>({hbox {H}}_{{2}})</span>–air mixtures, the transition-to-detonation velocity increased for a leaner and richer mixture. Moreover, it was observed that methane addition in general increased the pressure limit at the wedge tip necessary for the transition to detonation.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"35 3","pages":"249 - 255"},"PeriodicalIF":1.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical study of viscous effects on the formation of the Mach reflection in a transition from regular reflection 对从常规反射过渡到马赫反射过程中形成的粘性效应的数值研究

IF 1.7 4区工程技术

Shock Waves Pub Date : 2025-01-24 DOI: 10.1007/s00193-024-01213-1

G. Shoev, V. Nazarov, M. Timokhin

引用次数: 0

Development of a novel shock tube system to study shock-induced motion of a solid body 研究固体冲击运动的新型激波管系统的研制

IF 1.7 4区工程技术

Shock Waves Pub Date : 2025-01-24 DOI: 10.1007/s00193-025-01216-6

M. Oshima, K. Nakayama, Y. Sakamura

引用次数: 0

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