A theoretical analysis has been made to explore thermal entrance region heat transfer in nanofluids. The numerical model used in this paper is based on the Buongiorno model for convective heat transfer in nanofluids with modifications to fully account for the effects of nanoparticles volume fraction distributions on the continuity, momentum and energy equations. Numerical investigations have be...

Nanofluids (suspensions of nanometer-sized particles in base fluids) have recently been shown to have nucleate boiling critical heat flux (CHF) far superior to that of the pure base fluid. Over the past decade, numerous experimental and analytical studies on the nucleate boiling CHF of nanofluids have been conducted. The purpose of this article is to provide an exhaustive review of these studie...

The success of quenching process during industrial heat treatment mainly depends on the heat transfer characteristics of the quenching medium. In the case of quenching, the scope for redesigning the system or operational parameters for enhancing the heat transfer is very much limited and the emphasis should be on designing quench media with enhanced heat transfer characteristics. Recent studies...

Our recent work [1] theoretically revealed that speckles can be formed when nanofluids containing a modest volume fraction of nanoparticles are illuminated by a monochromatic laser beam. This paper focuses on the key issues, including the experimental setup, the particle volume fraction of the nanofluid, the flow velocity of the nanofluid and the diameter of the pipe, in measuring the velocitie...

Nanofluids are new generation heat transfer fluids and have opened a new horizon in the areas of heat transfer applications. Nanofluids are prepared by dispersing nano-sized metallic particles in conventional fluids of heat transfer. Heat transfer performance of nanofluid depends primarily on its thermo physical properties like viscosity, thermal conductivity, specific heat and density. Viscosi...

Experiments were performed using a flow-loop apparatus to explore the performance of nanofluids in cooling applications. The experiments were performed using exfoliated graphite nanoparticle fibers suspended in polyalphaolefin atmass concentrations of 0.6 and 0.3%.The experimental setup consisted of a test section containing a plain offsetfin cooler apparatus (gap or nongap fin), whichwas conne...

Hybrid nanofluids aim to further improve the characteristics of mono nanofluids. However, experimental studies that jointly explore physical properties hybrids and corresponding are missing. In this work, B4C TiB2 hybrid TiB2:B4C nanoadditives used for first time design based on propylene glycol:water 20:80 wt%. The density, isobaric heat capacity, thermal conductivity determined by oscillating...

This paper investigates hybrid nanofluids flowing around a circular cylinder of free convection under the constant surface heat flux. Nanoparticles copper oxides, Gold, and Aluminum (CuO, Au, Al) are considered to support transfer performance blood/water-based nanofluids. The governing model for which is in form non-linear partial differential equations (PDEs) first transformed more convenient ...

The optimization of the poor heat transfer characteristics of fluids conventionally employed in solar devices are at present one of the main topics for system efficiency and compactness. In the present work we investigated the optical and thermal properties of nanofluids consisting in aqueous suspensions of single wall carbon nanohorns. The characteristics of these nanofluids were evaluated in ...

This study explores the issue of micropolar fluids and heat transfer in a hybrid nanofluid through moving thin needle with prescribed surface flux. Here, SWCNT MWCNT are referred to as nanoparticles, Engine oil Refrigerant-134A working fluid. Similarity transformation is implemented acquire similarity equations, then numerically solved by utilizing shooting technique bvp4c function. Hybrid nano...