Nanofluids are the new generation way to enhance thermal properties of common fluids. The potential of nanofluidshave made them very useful in different heat transfer applications. In this paper, the injection velocity effects on copper nanofluids over permeable stretching/shrining surfaces are analysed in stagnation–point flow. Nanofluids are under the influence of magnetic field. The PDE gove...

The widely accepted model to explain the positive inotropic effect of cardiac glycosides invokes altered Na+-Ca2+ exchange activity secondary to Na+ pump inhibition. However, proof of this model is lacking and alternative mechanisms have been proposed. We directly tested the role of the Na+-Ca2+ exchanger in the action of the glycoside ouabain using Na+-Ca2+ exchanger knockout mice. Ablation of...

Helical coil heat exchangers are widely used in industrial applications ranging fromcryogenic processes, air-conditioning, and nuclear reactors to waste heat recovery due totheir compact size and high heat transfer coefficient. In this kind of heat exchangers, flowand heat transfer are complicated. This paper reports a numerical investigation of theinfluence of different parameters such as coil...

ABSTRACT This paper presents a failure analysis performed on tubes of heat exchanger. Heat exchangers are among the most common equipment in an oil refining industry, as transfer is one important and processes chemical petrochemical industries. The analyzed was condenser top system diethanolamine regeneration tower naphtha hydrotreating unit refinery. tubular bundle consists 78 ASTM A213 Grade ...

A passive residual heat removal exchanger (PRHR HX) was used as the research object, and an experimental device with conduction oil source set up to complete study of outside tube saturation boiling. The improved Wilson diagram method calculate data, transfer law boiling smooth finned obtained. Compared two types tubes, intensification rate 1.07, that 2.39, 2.23 times tube. According rate, Nu m...

In this study different nanofluids with phase change behavior were developed by mixing a molten salt base fluid (KNO3 selected as phase change material) with nanoparticles using the direct synthesis method. The thermal properties of the nanofluids obtained were investigated. Following the improvement in the specific heat achieved, these nanofluids can be used in concentrating solar plants with ...

In this paper, overall heat transfer coefficient and friction factor of water based γ-Al2O3 nanofluid in a double tube counter flow heat exchanger have been measured experimentally under turbulent flow condition. For better dispersion of γ-Al2O3 nanoparticles in distilled water, magnetic stirrer and ultrasonic vibrator (with a power of 240 kW and frequency of 35 kHz) were implemented. The stabi...

in this research, heat transfer enhancement and simultaneous effect of that on pressure drop inside condensers with twisted tape inserts are investigated. a refrigeration system is designed for attaining to maximum level of heat transfer with minimum pressure drop. the test condenser is a double pipe heat transformer with inner and outer diameter of 10.7mm and 12.7mm for internal pipe, respecti...