Analysis of the gas-surface interaction on the drag force acting on a sphere in a rarefied gas: free molecular regime and arbitrary Mach number

• Grant number: 22/00669-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: May 01, 2022
• End date: April 30, 2024
• Field of knowledge: Engineering - Mechanical Engineering - Transport Phenomena
• Principal Investigator: Denize Kalempa
• Grantee: Victor Sandrini dos Santos
• Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil

Abstract

The objective of the project is to analyze the influence of the gas-surface interaction on the drag force acting on a solid sphere in a rarefied gas with an arbitrary Mach number. The calculation of the drag force will be based on the Boltzmann equation and, due to the complexity of this equation, only the free molecular regime of the gas flow will be considered. As a boundary condition, first, the diffuse-specular scattering kernel proposed by Maxwell will be used. Subsequently, the scattering kernel proposed by Cercignani and Lampis will be implemented to verify the influence of the accommodation coefficients of tangential momentum and energy in the solution of the problem.(AU)