Numerical Investigation of the Microscopic Heat Current Inside a Nanofluid System Based on Molecular Dynamics Simulation and Wavelet Analysis

Abstract

Molecular dynamics simulation is employed to investigate the microscopic heat current inside an argon-copper nanofluid. Wavelet analysis of the microscopic heat current inside the nanofluid system is conducted. The signal of the microscopic heat current is decomposed into two parts: one is the approximation part; the other is the detail part. The approximation part is associated with the low-frequency part of the signal, and the detail part is associated with the high-frequency part of the signal. Both the probability distributions of the high-frequency and the low-frequency parts of the signals demonstrate Gaussian-like characteristics. The curves fit to data of the probability distribution of the microscopic heat current are established, and the parameters including the mean value and the standard deviation in the mathematical formulas of the curves show dramatic changes for the cases before and after adding copper nanoparticles into the argon base fluid.

Thermal Lensing of Multi-walled Carbon Nanotube Solutions as Heat Transfer Nanofluids

“…The complex molecular dynamics are often unraveled with the help of powerful mathematical tools. 29,30 Nonlinear multidimensional signal processing tools are recently employed to analyze the complex time-varying data like TL signals to study the molecular dynamics in nanofluids. 21,30,31 The nonlinear time series analysis is one such tool which gives valuable information regarding the complex dynamics of systems in terms of phase portrait and sample entropy.…”

“…The nonlinear time series and fractal analyses are found to be powerful mathematical techniques to ponder into the particle dynamics of the nanofluids in thermal energy transport. The complex molecular dynamics are often unraveled with the help of powerful mathematical tools. , …”