Nanofluid connotes a colloidal suspension with dispersed nano-sized particles. Experiments in the past decade reveal that nanofluids have a significantly higher thermal conductivity in comparison to that of the base fluid. Recently, a number of phenomenological models have been proposed to explain the anomalous heat transfer enhancement seen in nanofluids. In this paper, we make a systematic su...

The objective of the present study is the synthesis of MWCNT-TiO2 hybrid nanostructures by solvothermal synthesis method with TiCl4 as precursor. The heat transfer enhancement due to the use of MWCNT-TiO2 nanofluid was investigated. As-prepared hybrid materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that MWCNTs were uniformly dec...

Measurements of three-dimensional turbulent flow in the exit head section of a shell-andtube heat exchanger were performed using three-component laser Doppler velocimeter. The test geometry is half of a hemispherical cap with two outlet-tubes and with a cylindrical inlet section. Distributions of the velocity vector field, the three mean velocity components, and the Reynolds stress components a...

In this article, the failure of a heat exchanger during its operation in the marine environment has been analyzed. This heat exchanger was used for cooling the oil in a marine diesel engine. Based on the existing failure history, damages in engine components were observed after 89 hours of engine working due to the leakage of the sea water to the oil. For the objective of the failure analysis, ...

Nano fluids are widely used today for various energy-related applications such as coolants, refrigerants, and fuel additives. New coolants design modifications being explored due to renewed interest in improving the working fluid properties of heat exchangers. Several studies have investigated nanofluids enhance radiator exchanger performance. A new class includes single, binary, tertiary nanop...

This paper contains the results of a concise statistical review analysis of a large amount of publications regarding the anomalous heat transfer modes of nanofluids. The application of nanofluids as coolants is a novel practise with no established physical foundations explaining the observed anomalous heat transfer. As a consequence, traditional methods of performing a literature review may not...

The assessment of proposed origins for thermal conductivity enhancement in nanofluids signifies the importance of particle morphology and coupled transport in determining nanofluid heat conduction and thermal conductivity. The success of developing nanofluids of superior conductivity depends thus very much on our understanding and manipulation of the morphology and the coupled transport. Nanofl...

A comprehensive study of two-phase flow mechanisms and pressure drop in horizontal small hydraulic diameter tubes was conducted. Co-current flow of air-water mixtures in four round tubes and one rectangular tube with hydraulic diameters ranging from 5.5 mm to 1.3 mm were investigated. Bubble, dispersed, elongated bubble, slug, stratified, wavy, annular-wavy, and annular flow patterns were obser...