Abstract Nanofluids contain nanometer-sized particles in suspension to enhance heat transfer by increasing the thermal conductivity. This paper provides an overview of particle size and volume fraction nanofluids, their roles enhancing transfer. Often, is enhanced dispersed with small diameter high concentration despite some debate about governing effects. The design elliptical cross-section zi...

The performance of two evaporatively cooled heat exchangers is investigated under similar operating conditions of air flow rates and inlet hot water temperatures. The heat exchangers are plain and plate-finned circular tube types which occupy the same volume. Spray water, which is circulated in a closed circuit, is injected onto the exposed surfaces of the tubes and fins. The contact between ai...

Heat exchanger is a universal process equipment, which widely used in chemical industry, oil refining, thermal power and other industries. Shell-and-tube heat exchangers often fail prematurely due to flow-induced vibration. In this paper, aiming at the problem of severe vibration shell-and-tube an enterprise, acceleration sensors are measure shell tube side exchanger. Through analysis measureme...

During cross flow in a heat exchanger, heat transfer in the front portion of the tube is more compared to back portion of the tube. This is due to less formation of vortices at the backside of the tube. For uniform heat transfer to take place throughout the tube, it is necessary to increase the vortex formation at the rear side of the tube. The aim of this study is to explore the possibilities ...

Improving heat transfer and performance in a radial, finned, shell and tube heat exchanger is studied in this study. According to the second law of thermodynamics, the most irreversibilities of convective heat transfer processes are due to fluid friction and heat transfer via finite temperature difference. Entransy dissipations are due to the irreversibilities of convective heat transfer. There...

The aircraft environmental control system (ECS) is a critical aircraft system, which provides the appropriate environmental conditions to ensure the safe transport of air passengers and equipment. The functionality and reliability of ECS have received increasing attention in recent years. The heat exchanger is a particularly significant component of the ECS, because its failure decreases the sy...

The research about nanofluids has been explosively increasing due to their fascinating properties in heat or mass transportation, fluidity, and dispersion stability for energy system applications (e.g., solar collectors, refrigeration, heat pipes, and energy storage). This second part of the review summarizes recent research on application of TiO2 nanofluids and identifies the challenges and op...

Abstract A new coupled numerical model of the overall vapor-compression cycle and water heater was developed in order to analyze influence condenser coil designs on heat transfer process a helical exchanger immersed storage tank. The using CFD code ANSYS Fluent. In simulation, treated as an internal source initial flux obtained from experimental results delivered each element boundary condition...

A comprehensive review of published works dealing with numerical modelling forced convection heat transfer and hydrodynamics nanofluids is presented. Due to the extensive literature, limited straight, smooth, circular tubes, as this basic geometry in shell-and-tube exchangers. Works on tubes are presented chronologically first part article. Particular attention was paid method solution governin...