Heat pumping in nanomechanical systems.

Nonequilibrium Green's functions in the study of heat transport of driven nanomechanical systems

We review a recent theoretical development based on non-equilibrium Green’s function formalism to study heat transport in nanomechanical devices modeled by phononic systems of coupled quantum oscillators driven by ac forces and connected to phononic reservoirs. We present the relevant equations to calculate the heat currents flowing along different regions of the setup, as well as the power dev...

Intrinsic optical bistability in nanomechanical metamaterials at milliwatt power levels

We report the first demonstration of optical bistability in nanomechanical metamaterials arrays of plasmonic or dielectric resonators on flexible nano-membranes. Bistability results from the nonlinearity of the near-field forces induced by light. Optical bistability has received considerable attention over many years as it represents a fundamental building block for applications in optical swit...

Evaluation of energy wastage in agricultural pumping systems in shiraz region of iran

A steam Rankine cycle with two-stage pumping to enhance the waste heat recovery from internal combustion engines

In this research, a high-temperature Rankin cycle (HTRC) with two-stage pumping is presented and investigated. In this cycle, two different pressures and mass flow rates in the HTRC result in two advantages. First, the possibility of direct recovery from the engine block by working fluid of water, which is a low quality waste heat source, is created in a HTRC. Secondly, by doing this, the mean ...

Heat and Mass Transfer Analysis on MHD Peristaltic Prandtl Fluid Model through a Tapered Channel with Thermal Radiation

This paper deals with a theoretical investigation of heat and mass transfer with thermal radiation analysis on hydromagnetic peristaltic Prandtl fluid model with porous medium through an asymmetric tapered vertical channel under the influence of gravity field. Analytical results are found for the velocity, pressure gradient, pressure rise, frictional force, temperature and concentration. The in...