Mass-conserving weak solutions to the continuous nonlinear fragmentation equation in the presence of mass transfer

2024/11/23 by Ram Gopal Jaiswal, Jaiswal, Ram Gopal, Ankik Kumar Giri +1 · 1 citation
Mathematics · Engineering · Earth and Planetary Sciences · #advanced mathematical theories #Particle Dynamics in Fluid Flows #Aquatic and Environmental Studies

paper · pdf · doi:10.48550/arxiv.2411.15561

Abstract

A mathematical model for the continuous nonlinear fragmentation equation is considered in the presence of mass transfer. In this paper, we demonstrate the existence of mass-conserving weak solutions to the nonlinear fragmentation equation with mass transfer for collision kernels of the form Φ(x,y) = κ(x^σ₁ y^σ₂ + y^σ₁ x^σ₂), κ>0, 0 ≤ σ₁ ≤ σ₂ ≤ 1, and σ₁ ≠ 1 for (x, y) ∈ ℝ₊², with integrable daughter distribution functions, thereby extending previous results obtained by Giri & Lauren\c cot (2021). In particular, the existence of at least one global weak solution is shown when the collision kernel exhibits at least linear growth, and one local weak solution when the collision kernel exhibits sublinear growth. In both cases, finite superlinear moment bounds are obtained for positive times without requiring the finiteness of initial superlinear moments. Additionally, the uniqueness of solutions is confirmed in both cases.

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