The importance of interaction of exhaled air with the airway surface was evaluated by comparing the effects of different breathing maneuvers and inhaled air temperature on the relationship between breath alcohol concentration (BRAC) and blood alcohol concentration (BAC). Breath alcohol was measured with an infrared absorption unit. Blood and simulator liquid alcohol concentrations were measured...

During the solution heat treatment (SHT) process of aluminum alloys, precipitates dissolve into matrix. To predict dissolution time, modeling isothermal in 6061 alloy during SHT was conducted. A precipitate model established, and flowchart designed as well. Then explicit finite-difference method employed to solve model, mobile nodes used deal with moving interface. The simulation based on real ...

The influence of high-temperature argon heat-treatment on the microstructure and room- temperature in-plane tensile properties 2D woven CVI unidirectional MI SiC/SiC composites with Hi-Nicalon™-S SiC fibers was investigated. were heat-treated between 1200 1600 °C for 1- 100-hr, 1315 1400 up to 2000 hr. In addition, fast fracture strengths these also measured in air. Both exhibited different deg...

aqueous polymer quenchants are being used increasingly in steel heat treatment industries as a substitution for conventional quenchants. by adjusting the quench parameters of the polymeric media, it is possible to achieve desirable microstructure and mechanical properties in addition to reduction in distortion and cracking. in this work, polyalkylene glycol (pag) aqueous solution was used as th...

A combined heat transfer/kinetic model was developed to quantify temperature variations in small tubular batch reactors and estimate the effect of deviations from isothermal operation on the kinetics of biomass pretreatment. Assuming that heat transfer was dominated by conduction in the radial direction, a classic parabolic time-dependent partial differential equation was applied to describe th...

in this paper, we have considered the problem of rotating, magnetohydrodynamic heat and mass transfer by free convective flow past an exponentially accelerated isothermal vertical plate in the presence of variable mass diffusion. while the temperature of the plate is constant, the concentration at the plate is considered to be a linear function with respect to time t. the plate is assumed to be...

We consider non-isothermal torsional flow between two coaxial parallel plates with heat transfer at the upper rotating plate, constant temperature on the lower stationary plate, and no heat loss at the fluid-air interface. Viscous heating is modelled by a Nahme law with exponential dependence on temperature. Due to the highly nonlinear nature of the governing equations an exact solution is not ...

Abstract: The difference between quantum isoenergetic process and quantum isothermal process comes from the violation of the law of equipartition of energy in the quantum regime. To reveal an important physical meaning of this fact, here we study a special type of quantum heat engine consisting of three processes: isoenergetic, isothermal and adiabatic processes. Therefore, this engine works be...