the effects of drying conditions on moisture transfer

Effect of Ultrasound‐Assisted Osmotic Dehydration

Jun 23 2015Ultrasound application in drying foodstuffs aims at reducing the time needed to process and improve the quality characteristics of dried product In this study the effect of ultrasound‐assisted osmotic dehydration pretreatment on drying kinetics and effective moisture diffusivity of Mirabelle plum during drying was examined

Effect of Initial Moisture Distribution on the Transient

The effect of the initial moisture distribution on the transient heat transfer and moisture redistribution processes in fiberglass insulations is studied experimentally and numerically Moisture evaporation starts from the hot side of the insulation and the drying-front sweeps across the slab

SIMULATION OF THE HEAT AND MOISTURE TRANSFER PROCESS

The analysis of the effects of operating conditions on the temperature and moisture content within the bed is also carried out Key Words and Phrases: barley computer simulation grain storage heat and mass transfer mathematical model porous bed

SikaFilm protects concrete from the effects of excessive

Sika Film protects concrete from the effects of excessive moisture loss in rapid drying conditions Advantages Sika Film eliminates the need to add water to low slump concrete or sprinkle water on the concrete surface to aid in finishing

Effect of moisture transfer on heat energy storage in

looks for to identify the effects of moisture transfer on thermal inertia and for different materials through the case of a simple layer wall under internal periodical conditions To study moisture transfer in materials we used a coupled heat and moisture transfer model in which moisture transport is made through liquid and vapour phases

Investigating the Effect of Selected Parameters on

Aug 01 2018surrounding air method of drying moisture diffusivity and drying kiln structure [1 4 10] Researchers have investigated effect of various parameters on the drying of products such as longan bananas yam beans maize mango and cassava using forced convection dryers Drying air temperature in most of these

Computer Modelling of Nonisothermal Transfer of Moisture

This study explores the features of process of drying internal heat and mass transfer in wood in the conditions of essentially noniso-thermal transfer of moisture The process of capillary conductivity of wood is analyzed on the model of colloidal capillary-porous solid The density of moisture flows caused by the phenomenon of thermal

Effects of sulphiting and osmotic pre

Air dehydration of fruits has been reported to be limiting in some factors especially on the drying kinetics and quality of the dried fruits Removal of moisture during drying is attributed to these This study was designed to evaluate the effects of sulphiting and osmotic pretreatments on effective diffusion coefficient (Deff) of air drying pineapple slices at 50o and 70 oC temperatures

Numerical simulations of coupled moisture and heat

Abstract Finite element simulations of coupled thermal and moisture fields in wood during kiln drying were observed with a focus on non-isothermal moisture transfer in three dimensional orthotropic models of wood with an initial moisture content below the fiber saturation point

Effects of Different Drying Conditions on Key Quality

The drying kinetics for all operational conditions listed in Table 1 are presented in Figures 2 and 3 As noted drying kinetics were not a linear function of time and moisture content decreased exponentially with drying time the last step was represented by an almost horizontal line which marked the end of the drying process (equilibrium moisture content)

Section 4 Chapter 1 Fundamentals

Bound moisture Liquid physically and/or chemically bound to solid matrix so as to exert a vapor pressure lower than that of pure liquid at the same temperature Constant rate drying period Under constant drying conditions drying period when evaporation rate per unit drying area is constant (when surface moisture is removed)

Effects of Different Drying Conditions on Key Quality

The drying kinetics for all operational conditions listed in Table 1 are presented in Figures 2 and 3 As noted drying kinetics were not a linear function of time and moisture content decreased exponentially with drying time the last step was represented by an almost horizontal line which marked the end of the drying process (equilibrium moisture content)

Solids Drying: Basics and Applications

Apr 01 2014As drying proceeds moisture reaches the surface at a decreasing rate and the mechanism that controls its transfer will influence the rate of drying Since the surface is no longer saturated it will tend to rise above the wet bulb temperature

DE

Period C to D represents conditions when the drying rate is largely independent of conditions outside the solid The moisture transfer may be by any combination of liquid diffusion capillary movement and vapour diffusion 11 2 Estimation of Drying Time In order to determine the time required to achieve the desired reduction in product

Effect of contact ultrasonic power on moisture migration

Far‐infrared radiation (FIR) drying as one of the modern drying methods has desirable advantages including high‐energy efficiency and uniform heating However it has unsatisfied promoting effect on internal mass transfer Ultrasound has significant positive effect on moisture

Effect of Different Drying Conditions on the Mass Transfer

mass transfer characteristics strongly depend on the drying conditions Through the convective drying method parameters including moisture diffusivity mass transfer coefficient Biot number and drying time were varying from 0 16-1 4510-8-m2 s1 1 93-4 9510 -m s1 0 103-0 225 and 90-604 minutes respectively In comparison for

Mass and Heat Transport Models for Analysis of the Drying

The influence of boundary conditions on drying process was investigated The model is limited to the one-dimensional problem of an infinite slab In their works the thermophysical properties of the drying material are taken as constant and the effect of heat transfer on the moisture loss is neglected

Humidity Effects in Solids Drying Processes

result solids in a cool damp atmosphere will pick up more moisture than those stored in warm dry conditions X E is often plotted as an adsorption or desorption isotherm Equilibrium relative humidity (ERH) uses the principle in reverse HUMIDITY EFFECTS IN SOLIDS DRYING PROCESSES Ian C Kemp Senior Technical Manager GMS GlaxoSmithKline plc

Soybean Drying and Storage

Therefore drying soybean with natural air can be accomplished only if the air temperature and relative humidity conditions allow a net moisture transfer from soybean to the air The drying speed under natural-air drying depends on the moisture content of the soybeans as well as the temperature and relative humidity of the drying air

Kinetics of potato drying using fluidized bed dryer

Drying curves The drying times according to the experimental conditions selected are presented in Table 1 The drying curves of moisture content versus drying time for drying of potato cuboidal and cylindrical particulates for aspect 1:1 ratio at 50 60 and 70 C are presented in Fig 1 Similar trend was found for other aspect ratio of cuboidal as well as cylindrical shape of potato particulates

INFLUENCE OF DRYING CONDITIONS ON THE MOISTURE

In this way effective moisture diffusivity on drying conditions were determined The objective of this work on fluidized bed heat pump drying of bovine intestine are to study the effect of operating conditions on the moisture movement heat transfer effects (Sablani et al 2000) and it also neglects the initial thermal transient effect

BIOLOGICAL PRODUCT FREEZE

F Franks (Cambridge): Freeze-drying: from empiricism to predictability The significance of glass transitions 9 M J Pikal Karen Dellerman andM L Roy (Indianapolis): Formulation and stability of freeze-dried proteins: effects of moisture and oxygen on the stability of freeze-dried formulations of human growth hormone 21 Session II

Effects of Different Drying Conditions on Key Quality

The drying kinetics for all operational conditions listed in Table 1 are presented in Figures 2 and 3 As noted drying kinetics were not a linear function of time and moisture content decreased exponentially with drying time the last step was represented by an almost horizontal line which marked the end of the drying process (equilibrium moisture content)

The Drying of Foods and Its Effect on the Physical

microbial nature The drying rate is influenced by transfer mechanisms such as the vapour pressures of the food and of the drying air temperature and air velocity moisture diffusion in the product thickness and surface exposed for drying [1] Drying involves the use of heat to vaporize the water

FLAVOR QUALITY AND STABILITY OF POTATO FLAKES: EFFECTS

Dehydrated potato flakes were evaluated by sensory and GLC procedures to determine the effects of packaging and drying conditions on flavor quality and stability after storage in air Stability was not affected by the choice of metal vs polyethylene as the packaging material or by

High Temperature Spouted Bed Paddy Drying with Varied

Feb 06 2007The difference in moisture content between the initial and critical moisture contents varied between 4 5 and 8 0%d b depending upon drying conditions No significant effect on color was evident From the point of view of HRY the correct management of a two-stage spouted bed drying system could be a suitable and attractive alternative for

SIMULATION OF THE HEAT AND MOISTURE TRANSFER PROCESS

The analysis of the effects of operating conditions on the temperature and moisture content within the bed is also carried out Key Words and Phrases: barley computer simulation grain storage heat and mass transfer mathematical model porous bed