Modeling and Analysis of Viscous Dissipation Effect on Temperature in the Liquid Explosive Injection Process

Typically, viscous liquid explosives are injected into the warhead . The injection device consists of apiston which moves downward and leads the viscous fluid through a cylindrical duct towards the endof the duct. Then the viscous fluid entered into a converging nozzle and injected into the warhead orother ammunitions. This article is an analysis of heat transfer of fluid flow of the liquid explosive inthe converging nozzle, as a part of the injection device under exposer of heat flux from the walls. Also,viscous dissipation phenomenon is considered, which is due to the viscosity of the fluid. It will raisethe fluid temperature. Forced convection heat transfer is investigated analytically. Fully developedlaminar flow is assumed. This analysis is done by considering wall heating and wall cooling. Bycomparing the effect of viscous dissipation and heat flux, it is investigated that effect of which of themis more significant. Axial heat conduction is neglected. Physical properties are assumed to be constant.The theoretical analysis of the steady heat transfer in nozzle flow for non-Newtonian fluid withconsidering viscous dissipation term in energy equation is performed by an analytical method. Animportant feature of this approach is obtaining steady temperature distribution of explosive fluid inconverging pipe flow with viscous dissipation. Effects of the inlet velocity and density of liquidexplosive on the distribution of temperature are presented. Also, the effect of changing theconvergence angle on heat transfer is investigated.

Keywords:

Liquid Explosive , Discharger , InjectionViscous DissipationEnergy EquationExplosive Material (PBX)Temperature Distribution