Abstract To reveal the effects of microstructure characteristics including fiber shape, void, distribution pattern, and interphase on transverse moisture diffusivities unidirectional composites, steady analysis method based Fick’s law is adopted. The predicted numerical results are compared with from analytical models to demonstrate accuracy. From simulation results, it found that increase in o...

The effect of temperature and moisture content on the thermal properties such as thermal conductivity, specific heat andbulk thermal diffusivity was evaluated. The thermal conductivity was measured by the transient technique using a line heat source. The maximum slope method was used to analyse the line source heating data for thermal conductivity determination. The specific heat capacity was m...

In this study, the effect of hygrothermal conditioning on the moisture diffusion properties of the fabric composite (glass fiber/epoxy resin) was investigated. The water uptake of the specimens conditioned in humid environment at different relative humidities (0, 60 and 96 % r.h) at constant temperature (60°C) was evaluated by weight gain measurements. The moisture diffusion properties of the f...

A diagnostic framework is presented, based on the Nakamura effective diffusivity, to investigate the regional variation in eddy diffusivity. Comparison of three different diffusivity calculations enables the effects of locally enhanced tracer diffusion to be distinguished from the streamwise average and the distinction between locally generated complexity in the tracer structure and between tha...

The aim of this study was to evaluate water binding capacity selected varieties rice flours as prospective processing parameter for manufacturing gluten-free products. Water retention capability determined by measuring the effective diffusivity coefficient, DSC, absorption index and solubility index. It found that with decreasing particles size flour increasing. This phenomenon dependent also o...

In comparison to cocoa, little has been reported on the drying of cupuassu almonds that can be used produce cupulate, a chocolate type product. Thus, in this study thermophysical properties dry (moisture = 9.68 % d.b.) were determined as: thermal conductivity (k) 0.14 kW/(m.K), specific heat (cp) 2.86 kJ/(kg.K), diffusivity (?) 4.8·10-5 m²/s, effective (Deff) 9.94·10-10 - 6.29·10-10 m²/s and ac...

Drying has been widely studied as a necessary process in biomass utilization. The steam diffusion law plays an important role drying kinetics. kinetics of single particle using Fick’s second was this paper. A parabolic relationship appeared between the critical moisture content and temperature. decreased with increase temperature initial content. had significant effect on effective diffusivity ...

We study KPP pulsating front speed-up and effective diffusivity enhancement by general periodic incompressible flows. We prove the existence of and determine the limits c∗(A)/A and D(A)/A as A → ∞, where c∗(A) is the minimal front speed and D(A) the effective diffusivity.

The main aim of this study was to develop an integrated solar-tracking system maximize the efficiency solar heaters manufactured from recyclable aluminum cans (RAC) for optimum drying apple slices. results revealed that thermal air heater incorporated with a tracking unit significantly improved by about 45% compared conventional fixed at all tested flow rates. highest 87.1% equipped achieved ra...