Studies on the regression rates of three compositions of paraffin wax‐HTPB hybrid fuel grains in a stream of gaseous oxygen using two different swirl injectors at a fixed injection pressure were carried out. It was found that the regression rate in the hybrid fuel increases with increasing paraffin wax percentage, which may be attributed to melt‐flow effects. The local regression rates, average regression rates, fuel mass consumption rates, and total mass fluxes for the hybrid fuels were found to be dependent on the swirl injector configuration. All three hybrid fuels were characterized by scanning electron microscopy (SEM). Furthermore, the thermal stability and thermal degradation behavior of the hybrid fuels were investigated by DTA/TGA techniques.
The growth of spherulitic like crystal patterns in a dual substrate Belousov-Zhabotinski (BZ) reaction system has been studied. The solution phase reaction has been found to show concentric ring like wave pattern. A colloidal phase consisting of numerous fine solid particles have also been observed during reaction process, which initially forms the solid phase nucleation centers of dendritic character, and subsequently grow into spherulitic like crystal patterns. The reaction mechanism has been proposed, which illustrate possible reaction products formed during solution phase reaction that are inevitably involved in the formation of the dendritic nucleation centers. The spherulitic crystal pattern has been found to show transition in morphology by substituted organic substrate.The transition behaviour of crystal pattern has also been described and discussed.
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