Determination of the specific heat of evaporation of a liquid from dispersed solids in a wide temperature range

1966 ◽  
Vol 11 (5) ◽  
pp. 328-332
Author(s):  
M. F. Kazanskii ◽  
R. V. Lutsyk ◽  
V. M. Kazanskii
Keyword(s):  
Specific Heat ◽  
Wide Temperature Range ◽  
Temperature Range ◽  
Heat Of Evaporation

Specific heats of polymer powders by differential scanning calorimetry

1982 ◽  
Vol 60 (14) ◽  
pp. 1853-1856 ◽  
Author(s):  
Eva I. Vargha-Butler ◽  
A. Wilhelm Neumann ◽  
Hassan A. Hamza
Keyword(s):  
Differential Scanning Calorimetry ◽  
Specific Heat ◽  
Scanning Calorimetry ◽  
Temperature Range ◽  
Specific Heats ◽  
Powdered Form ◽  
Polymer Powders

The specific heats of five polymers were determined by differential scanning calorimetry (DSC) in the temperature range of 300 to 360 K. The measurements were performed with polymers in the form of films, powders, and granules to clarify whether or not DSC specific heat values are dependent on the diminution of the sample. It was found that the specific heats for the bulk and powdered form of the polymer samples are indistinguishable within the error limits, justifying the determination of specific heats of powders by means of DSC.

Characterization and determination of thermodynamic properties of waste cooking oil biodiesel: Experimental, correlation and modeling density over a wide temperature range up to 393.15 and pressure up to 140 MPa

2019 ◽  
Vol 497 ◽  
pp. 87-96 ◽  
Author(s):  
Rachid Aitbelale ◽  
Ilham Abala ◽  
Fatima Ezzahrae M'hamdi Alaoui ◽  
Abdelaziz Sahib Eddine ◽  
Natalia Munoz Rujas ◽  
...  
Keyword(s):  
Thermodynamic Properties ◽  
Wide Temperature Range ◽  
Waste Cooking Oil ◽  
Temperature Range ◽  
Cooking Oil ◽  
Experimental Correlation

Determination of the reflectivity of liquid semiconductors over a wide temperature range

1995 ◽  
Vol 16 (3) ◽  
pp. 841-849 ◽  
Author(s):  
R. Černý ◽  
P. Přikryl ◽  
K. M. A. El-Kader ◽  
V. Cháh
Keyword(s):  
Wide Temperature Range ◽  
Temperature Range ◽  
Liquid Semiconductors

scholarly journals ВПЛИВ РОЗЧИННИХ РЕЧОВИН НА СТАН ВОДИ В РОСЛИННИХ ТКАНИНАХ ТА КІНЕТИКУ ЇХ СУШІННЯ

2018 ◽  
Vol 82 (1) ◽  
Author(s):  
Наталія В. Дмитренко
Keyword(s):  
Specific Heat ◽  
Bound Water ◽  
The State ◽  
Raw Material ◽  
Joint Analysis ◽  
Plant Tissues ◽  
Calorimetric Experiment ◽  
State Of Water ◽  
Heat Of Evaporation

В роботі наведено літературні дані щодо впливу розчинних речовин різного типу на процес та механізм зв’язування води. Порівняно результати визначення стану води у вихідній рослинній сировині, які були отримані з розрахунку за межею гігроскопічності, з результатами прямого експерименту за методом диференціальної сканувальної калориметрії. Встановлено, що додаткове зв’язування води, вище ніж отримане з розрахунку, обумовлено наявністю розчинних речовин в рослинному соку. Сумісним аналізом експериментальних кривих зміни стану води, енергограм сушіння, кривих сушіння та кривих швидкості сушіння показано, що критичні точки процесу сушіння знаходяться у відповідності з динамікою зміни стану води в рослинних тканинах та кінетикою зміни питомої теплоти її випаровування. Встановлено значне зростання енерговитрат на випаровування води вже в другому періоді сушіння. Отримані результати дозволяють стверджувати, що воно відбувається через початок видалення води з гідратних оболонок розчинених речовин. На підґрунті проведеного дослідження уточнено механізм і послідовність видалення води зі зрізів рослинних тканин при сушінні. The paper presents literary data on the influence of soluble substances of different types on the process and mechanism of water binding in aqueous solutions. Using the method of differential scanning calorimetry, the state of water in the parenchyma tissues of apples and potatoes, in the root crops carrots and beet, and the woody tissues of annual willow shoots was determined. A change in the state of water in these plant tissues during dehydration has been studied. The results of the determination of the state of water in the initial plant raw material obtained from the calorimetric experiment were compared with the results obtained from the calculation according to the hygroscopicity limit according to the assumptions of the sorption isotherms method. It has been established that the amount of bound water in the tissues of plants obtained from the calorimetric experiment is higher than the amount of bound water obtained on the calculation from the limit hygroscopicity of plant tissues. The additional binding of water is due to the presence of soluble substances in plant juice. Using the method of synchronous measurement of mass loss of tissues during drying and the amount of heat consumed for dehydration, an experimental determination of the specific heat of evaporation of water from plant tissues during drying was performed (the drying energy curves have obtained). Using joint analysis curves of change of the state of water in plant tissues, curves of drying energy, drying curves and drying rate curves, it was established that the critical points of the drying process are in accordance with the dynamics of changes in the state of water in plant tissues and the kinetics of the change in the specific heat of evaporation of water. A significant increase in energy consumption for the evaporation of water was detected already in the second drying period of plant tissues. The results obtained allow us to state that this increase in energy costs is due to the beginning of the removal of water from the hydrated shells of substances dissolved in plant juice. On the basis of the research, the mechanism and sequence of water removal from the cut of plant tissues during drying has been made more accurate.

Evaluation of Mass Accommodation Coefficients of Water over a Wide Temperature Range and Determination of Diffusion Coefficient of Water in Nitrogen

2021 ◽  
Vol 42 (4) ◽  
Author(s):  
Yongyang Su ◽  
Wenliang Wang ◽  
Wei Wang ◽  
Lihua Zhai ◽  
Xiaopan Shen ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Wide Temperature Range ◽  
Temperature Range ◽  
Accommodation Coefficients
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