Nanofluids are engineered colloidal suspensions of nanoparticles in water, and exhibit a very significant enhancement (up to 200%) of the boiling Critical Heat Flux (CHF) at modest nanoparticle concentrations (50.1% by volume). Since CHF is the upper limit of nucleate boiling, such enhancement offers the potential for major performance improvement in many practical applications that use nucleat...

For exothermic fluid-phase reactions, a reactor which is cooled at the wall can exhibit multiplicity or parametric sensitivity_ Moreover, for heterogeneously catalyaed exothermic fluid-phase reactions, each of the catalytically active pellets in the reactor can exhibit multiplicity. Both forms of multiplicity can lead to thermal instability and as such have to he taken into account in reactor d...

The paper describes the design and implementation of a cutting fluid monitoring system, as well development an algorithm to increase life in machine tool reservoir. Cutting fluids are most common type coolant machining. During its use, it becomes contaminated gradually degrades until needs be replaced with fresh fluid. To effective service life, parameters should monitored at regular intervals,...

The objective of this work is to develop and validate a numerical model that can conduct a transient analysis of heat transfer and the corresponding damage in skin burns. Once this model is developed, an examination of the effect of cooling on reducing damage from skin burns is carried out. A finite element numerical model is used to simulate the conduction of heat and the transient progress of...

The most important components of electrical vehicles are the battery and related cooling system. These subsystems play a major role in determining overall electric vehicle performances. In this study, novel system with fluid cell is proposed, by which energy storage can be optimized through control temperature batteries. A sensitivity analysis conducted considering maximum temperature, heat rat...

in this paper, the heat balance of an engine was investigated experimentally. the experimental work was conducted on the ef7 natural gas fueled and turbocharged engine. the main goal was to develop an empirical equation to be able to predict the heat balance of the engine at various loads and conditions. the data were collected at four different conditions, two different loads and two different...

The paper compares conceptual designs of a microstructured reactor/heat-exchanger for the small-scale production C8+ range hydrocarbons from methanol over H-ZSM-5 catalytic coatings. In these designs, air was used as cooling fluid in adjacent channels. heat transfer characteristics single-zone reactor (with channels 500 μm diameter) and two-zone an additional coolant inlet) have been compared. ...

Few laboratory stands can simulate the operation of direct-flow boilers. The processes occurring therein are complex both hydraulically and thermophysically. A study fluid dynamics coolant in a cylindrical composite coil shows that it is possible to influence boiler performance. movement air through coils also interest for intensification heat exchange process steam Modern automation devices ma...

Thermal enhancement of a single mini channel in Proton Exchange Membrane Fuel Cell (PEMFC) cooling plate is numerically investigated. In this study, low concentration of Al2O3 in Water Ethylene Glycol mixtures is used as coolant in single channel of carbon graphite plate to mimic the mini channels in PEMFC cooling plate. A steady and incompressible flow with constant heat flux is assumed in the...