Araz Sarchami

Instability of Liquid Sheets

This chapter relates to the liquid sheets and their instability. Liquid sheet instability is due to the interaction between the liquid and its surrounding fluid. When the amplitude of a perturbation grows and reaches a critical value, sheet is disintegrated forming liquid ligaments. Here, the linear and nonlinear instability of an inviscid and viscous liquid sheet is discussed, showing the effect of the aerodynamic forces on the growth rate of the initially small perturbations. Other effects, such as the effect of initial velocity profile on the instability are also discussed.

Splash Plate Atomizers

Prediction of droplet size and velocity distribution produced by splash plate requires information on the liquid sheet characteristics and its breakup process. This chapter focuses on the sheet produced by splash plate nozzles and their characteristics such as sheet breakup length and produced droplet size. It explains different flow regimes occurring in splash plate nozzles as well as various breakup lengths provided by different researchers. Sheet formation phenomenon is explained theoretically and at the end correlations for droplet size prediction are provided.

Estimation of the Heat Generation in a Cutting Tool Using a Sequential Inverse Method

In this paper the Sequential Function Specification Method is used to estimate the transient heat flux imposed on the rake face of the cutting tool during the cutting operation. The cutting tool is modeled as a three dimensional object. The capabilities of the geometric modeling, mesh generation as well as solver of the commercial software ANSYS is utilized in order to reduce the time expended for modeling and direct heat conduction solution. This way the inverse heat conduction algorithm employs ANSYS as a subprogram through the ANSYS Parametric Design Language (APDL). The stability as well as accuracy of the heat flux estimation is investigated using familiar triangular as well as step heat flux test cases. The effect of noise level, the number of temperature sensors as well as their locations are investigated in order to arrive at an optimal experimental procedure. Finally, a typical temperature data during the working condition are used to recover the heat flux at the cutting tool surface.Copyright