Stefan problems for the diffusion–convection equation with temperature-dependent thermal coefficients. (September 2021)

• Record Type: Journal Article
• Authors: Bollati, Julieta; Briozzo, Adriana C.
• Is Part Of: International journal of non-linear mechanics. Volume 134(2021)
• Publication Date: 2021-09
• Subjects: Stefan problem -- Diffusion–convection equation -- Variable thermal coefficients -- Radiative–convective condition -- Fixed point -- Similarity solutions; Nonlinear mechanics -- Periodicals; Mécanique non linéaire -- Périodiques; Nonlinear mechanics; Periodicals; 531
• DOI: 10.1016/j.ijnonlinmec.2021.103732
• Languages: English
• ISSNs: 0020-7462

Abstract

Abstract: Different one-phase Stefan problems for a semi-infinite slab are considered, involving a moving phase change material as well as temperature dependent thermal coefficients. Existence of at least one similarity solution is proved imposing a Dirichlet, Neumann, Robin or radiative–convective boundary condition at the fixed face. The velocity that arises in the convective term of the diffusion–convection equation is assumed to depend on temperature and time. In each case, an equivalent ordinary differential problem is obtained giving rise to a system of an integral equation coupled with a condition for the parameter that characterizes the free boundary, which is solved through a double-fixed point analysis. Some solutions for particular thermal coefficients are provided. Highlights: One-dimensional one-phase Stefan problems with variable thermal coefficients. Stefan problems for the diffusion–convection equation analysed. Different boundary conditions at the fixed face. Equivalent ordinary differential problem, giving rise to an integral equation.