III International Conference

PP-III-82• diameter of its generating sphere;• interception degree (further called overlapping degree) – the distance from the center ofthe cell generating sphere to the plane intercepting a spherical segment referred to the celldiameter.The overlapping degree affects the window diameter – diameter of a circle resulting fromspherical surface intersection with the secant plane, as well as on the obtained foamedmaterial porosity. To exclude overlapping of the neighbor windows, overlapping degree islimited by some minimum value.For comparing the modeled HPHM structure with the real structure, the correlation ofone of the model geometry parameters (overlapping degree) with the real structure parameters(porosity, specific surface) was found.The stationary flow driven by the applied constant pressure drop was considered.Along with the laminar flow for the gas also the turbulent flow was considered using thek-ε turbulence modelIn terms of work on the thesis the HPHM hydrodynamic properties was compared withthose for materials with regular structure and also with filled materials characterized byrandom structure.Mathematical modeling of the flow was based on Navier-Stokes equations and wasrealized using the finite-element modeling packages (ANSYS and Fluent)Fig. 1. Dependence of pressure drop onvelocity of a water for HPHM withd c =0.9 mm with porosity П=0.9,height of layer L=15 mm. 1 – experiment;2 – simulationFig. 2. Dependence of pressure drop onvelocity of air for HPHM with d c =2.1 mmwith porosity П=0.9, height of layerL=70 mm. 1 – experiment; 2 – turbulent;3 – a laminar condition.The work was carried out under support of grant of Russia President YC-3632.2005.8.625