Year: 2024
Type: article
Abstract: This study investigates the development of thermal caustics within particle-laden turbulent flows, a concept recently proposed to elucidate the non-smooth behavior of particle temperature during fluid–particle thermal interactions, drawing a parallel to the creation of caustics. The temperature variations observed between closely spaced particles, which are linked to thermal caustics, stem from the history of their different paths. This work delves into the emergence of thermal caustics by analyzing the dynamics of the gradient of particle temperature in the configuration space, highlighting the influence of both particle and thermal inertia. The analysis indicates that thermal caustics arise concurrently with caustics, with the exception of the condition of zero thermal inertia, which represents a singular scenario where particle temperature decouples from velocity.
Source: Physics of Fluids
DOI: 10.1063/5.0245243
Authors: Hamid Reza Zandi Pour, Michele Iovieno
Institution: Politecnico di Torino
Language: English
Subfield: Ocean Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4405620466