Abstract: Two-dimensional (2D) materials are one of the most active areas of nanomaterials research due to their potential for integration into next-generation electronic and energy conversion devices. The discovery of stanene, a buckled monolayer of tin atoms arranged in a 2d honeycomb lattice, has explored enormous research interest in the materials in the two-dimensional (2D) realm. Stanene exhibit ductile nature and hence could be easily incorporated with existing technology in semiconductor industry on substrates in comparison to Graphene. The systematic investigation of phonon group velocities is needed for complete theoretical analysis of thermal energy transportandthermal conductivity of Stanene. The general three dimensional continuum model of phonons in two dimensional materials is developed for the theoretical prediction of the important thermal properties. The acoustical and optical contributions to the phonon group velocities are evaluated within the framework of Bond Charge Model. We, at present find the Phonon group velocities along symmetry directions using Adiabatic Bond Charge Model with the help of PYTHON Program. We hope that phonon group velocities along Г‒M of Stanene, 2D materials will have reasonably similar result obtained by other researchers.Abstract: Two-dimensional (2D) materials are one of the most active areas of nanomaterials research due to their potential for integration into next-generation electronic and energy conversion devices. The discovery of stanene, a buckled monolayer of tin atoms arranged in a 2d honeycomb lattice, has explored enormous research interest in the materials in the...Show More
Abstract: The aim of this work is the modeling by a numerical approach of the behavior of a compound parabolic trough concentrator (CPC) with double glazing using a nanofluid as working fluid. The base fluid is jatropha oil for it does not have an ecotoxic impact. The thermal oil, jatropha oil, selected takes into account the constraints related to sustainable development by reconciling ecological, social and economic aspects. The nanofluid used is aluminum oxide having a cylindrical shape with a dimension of 20 nm added to jatropha oil (Al2O3+jatropha oil). The volume fraction of the nanofluid is 10%. The numerical model developed is based on the detailed analysis of the different forms of heat transfer that occur in the CPC. The equilibrium equations for each element of the system have been set up. The different heat exchanges that took place in each compartment of the CPC were described. The heat transfer equations were solved by the Gauss-Seidel’s method. An advanced difference scheme is used for the storage terms and a decentered scheme for the transport terms. The numerical simulation has been implemented by matlab code. The effects of varying the mass flow rate and the width of the CPC canopy on the different parameters such as the fluid outlet temperature and the thermal efficiency of the collector are analyzed. The theoretical results showed that the lower the mass flow rate, the higher the fluid outlet temperature and thermal efficiency. They also establish that as the width increases the fluid temperature and thermal efficiency increases. The opening angle and the reflectance coefficient have an influence on the CPC operation. The higher these two parameters are, the higher the output temperature.Abstract: The aim of this work is the modeling by a numerical approach of the behavior of a compound parabolic trough concentrator (CPC) with double glazing using a nanofluid as working fluid. The base fluid is jatropha oil for it does not have an ecotoxic impact. The thermal oil, jatropha oil, selected takes into account the constraints related to sustainab...Show More
