The thermophysical properties of the working fluid play a significant role in determining the performance of a heat exchanger. The effect of three different nanofluids, viz., the suspensions of single Fe3O4 and SiC nanoparticles and the hybrid mixture of Fe3O4 and SiC in a volume ratio of 50:50 (hybrid nanofluid) is experimentally studied using the Double Pipe Heat Exchanger (DPHE). The base fluid

The present experimental work is a comprehensive study of heat transfer and flow field characteristics inside a rectangular duct integrated with ribs of variable cross-section on the bottom wall. Four kinds of rib configurations, i.e., square (CASE-1), pentagonal (CASE-2), trapezium (CASE-3) and truncated prismatic (CASE-4), are deployed in the cooling passage for improving the thermal performance

The thermal performance of wavy channels with different phase shift (ϕ= 0o and 180o) introduced between the top and bottom conducting walls have been experimentally investigated using a typical Mach-Zehnder Interferometer. The experiments have been performed on compact plane and wavy channels (with varying phase shifts) with similar hydrualic diameter for de-ionised water (Pr = 6.13) in a range of

In the present paper, a proposal for enhancement of flow boiling is made by developing tubes with intelligently designed internal structures inside tube. Experiments have been conducted with R407C refrigerant. Heat flux from 5 to 12.5 kWm-2 and mass flux from 40 to 200 kgm-2s-1 has been considered as experimental range in in-house setup. The heat transfer characteristics of the newly developed tube

Boiling heat transfer with pure fluids significantly deteriorates under downward-facing heater (-1g) and in narrow-gaps/confined-spaces where surface-tension dominates over buoyancy. Addition of amphiphilic additives such as surfactants and ionic-liquids in water are well known to enhance boiling heat transfer (both heat transfer coefficient, HTC and critical heat flux, CHF) under the downward-facing

During the free-surface circular water jet impingement cooling of a heated surface (250-900°C), rewetting is an important phenomenon that can directly be correlated with the measured surface temperature history and the heat flux distribution. In the present work, an experimental study of water jet impingement cooling is done on a heated horizontal SS-304 plate of dimension 78 × 78 × 13 mm3 instrumented

This special issue of Journal of Enhanced Heat Transfer (JEH(T)) contains a collection of six extended papers from the IHMTC 2019 conference.

In the present study, thermohydraulic characteristics of heat sinks with short micro pin fin (height of fin shorter than the total height of heat sink) of different shapes (square and elliptical) and different arrangements (interrupted and staggered) are studied considering De-ionized (DI) water as the coolant. Experiments are conducted on silicon heat sink fabricated using wet etching. The pressure

Polymers are usually known for its low thermal conductivity. However, high thermal conductive polymers are in growing demand in industry nowadays for their low density, low cost, flexibility, and good environmental resistance compared with conventional substances of high thermal conductivity. Composites filled with high thermal conductivity nanofillers will increase the their thermal conductivity (k)

Thermoelectric generators (TEGs) have attracted increasing interest due to the direct conversion from heat to electricity. However, relatively low conversion efficiency limits their widely application in the future. One of the crucial factors affecting the TEG performance is the thermal contact resistance (TCR). Especially, TCR matching at the interfaces of p- and n-thermoelements strongly affects

Device miniaturization and complex work load due to rapid growth in technologies have imposed great challenge in thermal management aspect to prevent overheating. Nanofluids are emerging thermal solutions due to their enhanced thermal properties. Recently, graphene oxide (GO) has been proposed due to its high thermal conductivity. This study investigates the thermal performance of graphene oxide nanofluids

To enhance constrained melting with natural convection inside horizontal H-shaped capsule filled with ice/water as phase change material (PCM), adiabatic curved sidewalls are used. Complete pure PCM melting inside this novel system is not achieved because energy input from hot surfaces overheats molten PCM on top section while stable thermal stratification on bottom section persists. Although, full

The heat transfer characteristics of gravity heat pipes (GHPs) with internal helical microfins (IHMs) were investigated experimentally, in comparison with smooth GHPs. The influence of different IHM arrangements on the GHPs was obtained. Four types of GHPs were designed and fabricated: GH-PIHM1 (GHP with IHM arranged only in the condenser section); GHPIHM2 (GHP with IHM arranged in both the condenser