An experimental methodology was developed to improve the energy design of paddle dryers for sewage sludges. A laboratory batch dryer with a vertical agitator has been especially designed and instrumented to determine the heat flux densities. To determine the drying kinetic and the evaporating flow rates, the specific heat and the total heat of desorption of the sludge were measured using calori...

BACKGROUND Hair dryers are commonly used and can cause hair damage such as roughness, dryness and loss of hair color. It is important to understand the best way to dry hair without causing damage. OBJECTIVE The study assessed changes in the ultra-structure, morphology, moisture content, and color of hair after repeated shampooing and drying with a hair dryer at a range of temperatures. METH...

A mathematical model of the coupled heat and mass transfer has been developed to calculate the drying process in a mixed-flow grain dryer. Periodical discharge operation of the dryer causes strong variations of temperature and moisture of the material. A series of quasi-stationary drying experiments have been carried out. These results are used to test and to improve the dryer model. The calcul...

This study was conducted to determine that carrot powder obtain by different drying methods (oven and vacuum-freeze dryer) of carrot unfit for human consumption that whether feed additives in animal nutrition or not. Carrots randomly divided 2 groups. First group was dried by using oven, second group was by using vacuum freeze dryer methods. Dried carrot prepared from fresh carrot was analysed ...

This study is aimed at investigating the moisture sorption behavior and thin-layer drying kinetics of local sweet potato sada (LSPS) variety slices. The tubers were sliced 3, 5, 7 mm dried temperatures 45, 55, 62°C a constant air velocity 0.6 m/sec in laboratory-scale cabinet dryer. BET (Brunauer, Emmet, Teller) GAB (Guggenheim-Anderson-De Bore) models applied to fit data. Fick’s diffusion equa...

The development of a low temperature storage cabinet for the preservation of viruses and other infectious agents some years ago (Horsfall, 1940) led to the use of similar solid C02 cabinets in numerous laboratories. The original cabinet has been in continuous operation for more than 11 years, and others more or less like it have been operating for almost as long. Despite the generally satisfact...

Significance: Sep 30, 2002 Identified By: NRC Item Type: FIN Finding UNEXPECTED CHANGES IN UNIT 2 OPERATING PARAMETERS AND DRYER FAILURE DUE TO FLOW INDUCED VIBRATION. The failure to consider the impact of new flow induced vibration failure mechanisms on the Unit 2 steam dryer as part of the extended power uprate analysis resulted in unexpected and unpredictable changes in reactor power, reacto...

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 &...