This study reports a preparation method of a new moisture swing sorbent for CO2 capture from air. The new sorbent components include ion exchange resin (IER) and polyvinyl chloride (PVC) as a binder. The IER can absorb CO2 when surrounding is dry and release CO2 when surrounding is wet. The manuscript presents the studies of membrane structure, kinetic model of absorption process, performance o...

7 The effects of entrained air on microstructure and transport properties of concrete with up to 11.5% air at different w/c 8 ratios, curing and conditioning regimes were investigated. It was found that air voids disrupt the packing of cement and 9 increase the heterogeneity of the microstructure. The width of the affected interface is around 30 μm. Gaseous 10 diffusivity and permeability are i...

Ultrasonic energy was applied to assist the wood vacuum drying process. At a drying temperature of 60°C, the absolute pressure was either 0.05 MPa or 0.08 MPa; the ultrasonic power and frequency were 100 W and 28 kHz, respectively. The results showed that the effective water diffusivity of the specimens dried by the ultrasonic assisted vacuum drying at 0.05 MPa or 0.08 MPa were higher than that...

Thermal properties are necessary for the design and control of processes and storage facilities of food materials. This study proposes the measurement of thermal properties using easily constructed probes with specific heat capacity calculated, as opposed to the use of Differential Scanning Calorimeter (DSC) or other. These probes were constructed and used to measure thermal properties of white...

Thermal parameters of food flour moisture content and temperature give an insight in the development prediction models that meet needs process design models, it also determine thermal load a particular product during handling. The bulk density (ρ), conductivity (k), specific-heat capacity (Cp) diffusivity (α) Illa Ekpoma rice were studied at varied (MC) (%) level. results showed significance pr...

This study compares the infrared drying kinetics, effective moisture diffusivity, activation energy and color qualities of organically conventionally produced sweet red peppers (Capsicum annum L.) dried at three different temperatures (60, 70 80°C). Results showed that entire process for both organic conventional took place mainly in falling rate period. Increasing temperature decreased time co...

Drying kinetics of coir pith was studied and the properties of compressed coir pith discs were analyzed. Coir pith particles were oven dried in the range of temperatures from 100 to 240 °C and the rehydration ability of compressed coir pith was evaluated by finding the volume expansion. The optimum drying temperature was found to be 140 °C. Hot air drying was carried out to examine the drying k...

Two finite difference discretization schemes for approximating the spatial derivatives in the diffusion equation in spherical coordinates with variable diffusivity are presented and analyzed. The numerical solutions obtained by the discretization schemes are compared for five cases of the functional form for the variable diffusivity: (I) constant diffusivity, (II) temporally-dependent diffusivi...

hydraulic attributes play important role in hydrological studies, soil conservation, designing irrigation and drainage systems, soil conservation, and controlling soil erosion in watersheds. their measurements are very tedious and time consuming and due to high spatial variability, a large number of measurements are required for obtaining reliable values. nowadays, prediction of these attribute...

Fresh and ripe mango (Mangifera indica) slices cv Dasheri were dehydrated in a cabinet dryer at drying air temperatures of 50, 60, 70 oC slice thickness 5 mm. Before dehydration, the pre-treated with potassium meta-bisulphite (KMS) three levels (0.5 %, 1.0 1.5 % KMS, respectively). Five semi-theoretical empirical thin-layer models (Newton [Lewis], Logarithmic, Demir et al. 2004, Henderson &...