The effectiveness of the heat transfer fluid in cooling or heating process determines optimal performance nuclear reactor, microelectronic devices, and chip production. Since thermal conductivity improved hybrid nanofluids, current study sought to investigate unsteady free convection nanofluid flow near a stagnation point as influenced by g-jitter. A consisted copper (Cu) alumina (Al2O3) nanopa...

: The effective dynamic viscosity was measured in the graphite water-based nanofluids. The shear thinning non-Newtonian behavior is observed in the measurement. On the basis of the best fitting of the experimental data, the viscosity at zero shear rate or at infinite shear rate is determined for each of the fluids. It is found that increases of the particle volume concentration and the holding ...

Introduction Alkaline earth oxides (AEOs) such as BaO have received considerable attention for their application in the lean-burn engine NOx storage/reduction (NSR) technology [1]. Previous experimental investigations have indicated that barium nitrate is the most stable form of the stored NOx in Ba-containing NSR catalysts. Two distinctive types of barium nitrates, Ba(NO3)2, i.e. “surface” and...

Four catalysts—1%Pd-2%Mn/γ-Al2O3, 1%Pd/γ-Al2O3, 2%Mn/γ-Al2O3 and γ-Al2O3—were synthesized via a sol–gel method characterized using various techniques to evaluate their physicochemical, textural, surface acidic properties. They were used in the catalytic transformation of ozone nitrogen oxides situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) analysis. Different consecuti...

The effects of ceria and zirconia on the structure-function properties of supported rhodium catalysts (1.6 and 4 wt % Rh/γ-Al2O3) during CO exposure are described. Ceria and zirconia are introduced through two preparation methods: 1) ceria is deposited on γ-Al2O3 from [Ce(acac)3] and rhodium metal is subsequently added, and 2) through the controlled surface modification (CSM) technique, which i...

In this study, the effect of various concentrations Al2O3-water nanofluid on heat transfer in duct with a square cross-section, under conditions continuous flux and laminar forced flow, investigated numerically. Reference experi-mental application parameters are accepted as reference, calculated single phase homogeneous model (SPHM) Brownian (SPBM) models, average coefficient results numerical ...

Viscosity is a crucial thermophysical feature of substance that must be accurately determined before designing system with nanofluid as the working fluid. In this study, modern technique committee machine intelligent (CMIS) used for establishing predictive model relative viscosity water-based nanofluids. The was developed by considering 1440 experimental data points different types nanofluids c...

Nanofluids have great potential to improve the heat transfer properties of liquids, as demonstrated by recent studies. This paper presents a novel idea utilizing nanofluid. It analyzes performance HVAC (Heating Ventilation Air Conditioning) system using high-performance fluid (water-glycol nanofluid with nanoparticles Al2O3), in university campus Lecce, Italy. The work describes dynamic model b...