Nonclassical gasdynamics: theory and experiments on nonlinear wave propagation in BZT fluids

The study of compressible fluid dynamics has traditionally focused on flows of gases whose thermodynamic properties are related according to the ideal-gas law. In this context, for a long time, it has been demonstrated that shock waves in gases are exclusively of the compressive type, characterized by a discontinuity across which the fluid...

Experimental investigation on the structural response of RC slabs subjected to combined fire and blast

Reinforced concrete (RC) submerged floating tunnels (SFTs) represent a possible solution for crossing wide, deep fjords, and is considered for the E39 highway route along the Norwegian west coast. With regard to SFTs, the specific accidental scenario that is under investigation is the combined action of fire and subsequent internal explosion,...

Experimental Observation of Non-Ideal Compressible Fluid Dynamics: with Application in Organic Rankine Cycle Power Systems

Shock-Induced Borehole Waves and Fracture Effects

We perform wave experiments using a vertical shock tube setup. Shock waves are generated by the rupture of a thin membrane. In the test section, the incident pressure waves generate borehole-guided waves along water-saturated samples. The tube is equipped with side wall gages and a mobile pressure probe, so that the attenuation and reflection of...

Unsteady Compressible Two-Fluid Flow Model for Interface Capturing: On the Dynamics of a Shock-Bubble Interaction

Multi-fluid flows are found in many applications in engineering and physics. Examples of these flows from engineering are water-air flows in ship hydrodynamics, exhaust-air flows behind rockets, gas-petrolea flows in upstream pipes of oilrigs, air-fuel bubble interaction flows in scramjets and many others. To gain better insight in the behavior...

Numerical investigation of two-phase gas-particle flow in a hypersonic shock tunnel

The paper describes the results of computational simulation of an unsteady two-phase gas-particle flow in a hypersonic shock tunnel. The tunnel consists of a heated shock tube, a convergent-divergent nozzle linked up with the low-pressure chamber of the tube, a test section where a model is placed, and a exhaust chamber. In calculations, the...

Measurements of shock-induced guided and surface acoustic waves along boreholes in poroelastic materials

Acoustic experiments on the propagation of guided waves along water-filled boreholes in water-saturated porous materials are reported. The experiments were conducted using a shock tube technique. An acoustic funnel structure was placed inside the tube just above the sample in order to enhance the excitation of the surface modes. A fast Fourier...