An experimental facility was developed to determine fundamental characteristics of combined impingement and through air drying of paper Removal of impingement boundary layer humidity by through flow makes both components of the combined process nonadiabatic complicating the analysis Drying Shrinkage The loss of moisture from concrete after it hardens and hence drying shrinkage is inevitable unless the concrete is completely submerged in water or is in an environment with 100 percent relative humidity Thus drying shrinkage is a phenomenon that routinely occurs and

Shrinkage Characteristics of Potatos Dehydrated Under

ABSTRACT A study of the pysical structure and quality potatoes during microwave and air drying war undertaken The effect of various experimental variables on volumetric shrinkage including microwove power levels air temperature and velocity as well as sample geometry was investigated In both microwave and air drying the shrinkage of potatoes showed a linear

May 01 2002Air impingement drying of digestate Study on kinetics of flow characteristics in hot air drying of pineapple Effect of shrinkage on isothermal drying behavior of 2-phase olive mill waste Journal of Food Engineering 2011 103 (4) 434-441 DOI: 10 1016/j jfoodeng 2010 11 013

The effects of air temperature (40 50 and 60C) air velocity (3 0 8 0 and 13 0 m/s) and air relative humidity (10 20 and 40%) on air impingement drying characteristics of carrot cubes and the quality of dried carrots were investigated The drying experiments were carried out according to orthogonal design method on the air impingement dryer

Apr 15 2014Many researchers reported that FIR could be combined with other drying techniques in order to obtain better quality of dried products and to reduce the drying time such as FIR-convection drying (Itoh 1986 Afzal et al 1999 Mongpraneet et al 2002 Ning et al 2013 Puente-Daz et al 2013) FIR-hot air impingement drying (Supmoon and

The use of expansive cement can also help in the control of plastic shrinkage Drying Shrinkage in Concrete Drying shrinkage is caused by the loss of surface -absorbed water from the calcium silicate hydrate ( C-S-H) gel and also due to the loss of hydrostatic tension in the small pores Swelling is the opposite phenomenon of shrinkage

INCREASING THE DRYING EFFICIENCY OF CYLINDER DRYING

The potential of impingement drying for improving paper quality was demonstrated especially for prevention of shrinkage of paper during drying Shrinkage prevention has a positive influence on the tensile properties of paper Shrinkage prevention still needs verification in a larger scale however

Drying Shrinkage Characteristics of Concrete Reinforced With Oil Palm Trunk Fiber ZAKIAH AHMAD* AZMI IBRAHIM Drying shrinkage is the reduction in volume caused principally by the loss of water during the drying process If weight of the fiber in air and Mfs is the weight of the fiber in solvent

Apr 01 2002A higher rate of evaporation during the falling rate period was obtained when superheated steam drying was compared to air impingement drying Potato chips produced using superheated steam impingement drying showed more shrinkage higher bulk density lower porosity and lighter color than chips dried with air under the same temperature and

In this work a model of convective drying of mango slices was developed and validated by experiments This model was established by considering slices shrinkage in the energy and the mass balances during the thin layer drying The drying kinetics and the temperature curves of the product were simulated using the model at various drying temperatures

Aug 20 2015The main objectives of the present study were to investigate the drying characteristics and quality attributes of apple slices The samples were dried at different air temperature levels (50 60 and 70 C) and a constant air velocity (1 5 m s−1) It was observed that the drying air temperature affected the dehydration rate significantly

The obvious advantage of air drying is its low capital cost in comparison to kiln drying procedures Kiln operators often find that it is more economical to air dry timber to 25% to 30% moisture content if the material is likely to take more than 5 weeks to kiln from green due to its size or the drying characteristics of the timber

Coating shrinkage upon drying is a phenomenon well known to the paper coating industry where it often causes film forming and compressibility characteristics of the coating structure and binders 50-70 w/w% of solid content and is usually dried thermally using infra red and hot air dryers Other compounds

The findings contribute to a better understanding of air impingement drying characteristics of orange peel and help to optimize drying conditions for the maximum preservation of its phytochemicals and antioxidant capacity Practical applications As the primary by‐product of orange juice processing orange peel is an excellent source of

Influence of Different Hot Air Drying Temperatures on

Drying characteristics of persimmon cv "Rojo Brillante" slabs were experimentally determined in a hot air convective drier at drying temperatures of 45 50 55 60 and 65 C at a fixed air velocity of 2 3 m/s It was observed that the drying temperature affected the drying time shrinkage and colour Four empirical mathematical models namely Enderson and Pabis

Chlorophyll a content decreased with increasing drying temperatures with losses between 8 9 6 7 and 35 5 6% while degradation of chlorophyll b was negligible In conclusion the air drying of Galega kale without any pretreatment resulted in considerable deterioration of its quality characteristics and nutritional value

The literature on the heat transfer occurring from impinging hot air jets now employed in many driers is reviewed Variations in average and local heat transfer coefficients and other parameters are discussed in respect to jet air velocity distance from jet to the impinged surface and jet turbulence level Areas which require additional research are pointed out in addition to a

Abstract: 【Objective】In order to improve the drying quality and drying efficiency of purple sweet potato (PSP) the effects of different conditions on PSP air-jet impingement drying characteristics were studied and the optimum drying model was sereened out 【Method】The PSP are dried by air-impingement jet drying The influence on the drying characteristics

Influences of drying air temperature radiation distance slice thickness and wavelength on drying time energy consumption and product quality (color shrinkage rehydration and total saponin) were investigated in combined infrared and hot air impingement drying (IR-HAD)

Apparatus and a related method control within acceptable limits of less than two percent (2%) residual shrinkage in garments to be made from a knitted fabric web or other fabrics subject to high shrinkage The knitted fabric web is passed continuously in a moist condition through a first shrinkage compactor Then the web is carried on an endless belt through a special dryer in a

Impingement drying is a very efficient way of drying the paper web The drying medium of impingement drying is air Impingement drying is a very efficient way of drying the paper web Effective drying is gained by blowing hot high velocity air onto the sheet and circulating the air back to the dryer This method yields considerably higher specific evaporation rate than

The amount a piece of wood will shrink lengthwise called longitudinal shrinkage is so small—typically about 0 1% to 0 2%—that it is usually inconsequential to the volumetric shrinkage However plywood greatly benefits from the low longitudinal shrinkage of wood—layers of wood veneer are glued together with the grain direction of each ply oriented