Determination of the thermodynamic functions of the moisture absorbed by a disperse body from its specific heat of evaporation

1965 ◽  
Vol 9 (3) ◽  
pp. 221-223
Author(s):  
V. M. Kazanskii
Keyword(s):  
Specific Heat ◽  
Thermodynamic Functions ◽  
Heat Of Evaporation

scholarly journals Measurement of the specific heat and determination of the thermodynamic functions of relaxed amorphous silicon

2013 ◽  
Vol 113 (17) ◽  
pp. 173515
Author(s):  
P. Roura ◽  
F. Taïr ◽  
J. Farjas ◽  
P. Roca i Cabarrocas
Keyword(s):  
Specific Heat ◽  
Amorphous Silicon ◽  
Thermodynamic Functions

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.

scholarly journals RESEARCH OF THERMAL CHARACTERISTICS OF WILLOW SHOOTS BY DEVICT OF SYNCHRONOUS THERMAL ANALYSIS

2018 ◽  
Vol 37 (2) ◽  
pp. 77-84
Author(s):  
N. V. Dmytrenko ◽  
S. O. Ivanov ◽  
Yu. F. Snezhkin ◽  
L. V. Dekusha
Keyword(s):  
Thermal Analysis ◽  
Heat Capacity ◽  
Specific Heat ◽  
Thermal Characteristics ◽  
Synchronous Thermal Analysis ◽  
Heat Of Evaporation

The article presents the operation principle of the device DMKI-01 and results of determination of heat capacity and specific heat of evaporation from the tree tissues of oneyear shoots of willow.  

The Determination of the Specific Heat of Heavy Mineral Oils

1920 ◽  
Vol 12 (9) ◽  
pp. 891-894 ◽  
Author(s):  
Herbert S. Bailey ◽  
Carlton B. Edwards
Keyword(s):  
Specific Heat ◽  
Heavy Mineral ◽  
Mineral Oils

scholarly journals XVII. On the atomic weight of glucinum (Beryllium)

1883 ◽  
Vol 174 ◽  
pp. 601-613
Keyword(s):  
Specific Heat ◽  
Volatile Compound ◽  
Atomic Weight ◽  
Normal Number ◽  
Vapour Density ◽  
Atomic Heat ◽  
Lothar Meyer ◽  
Free Metal

I. Introductory. Ever since the discovery of glucinum by Vauquelin, in 1798, its atomic weight has been a disputed matter amongst chemists. Its discoverer considered that its oxide was a monoide, an opinion which was however strongly opposed by Berzelius, who wrote the oxide Gl 2 O 3 and the atomic weight 13⋅7 (O=16). The researches of Awdejew and Debrayt again turned the scale in favour of the earlier view, and as an atomic weight of 9⋅2 suited the properties of the metal in the tables of periodicy constructed by MM. Mendeleef and Lothar Meyer, this atomic weight has, up to quite recently, been generally accepted by chemists. As a welcome confirmation to this came a determination of the specific heat of the metal by Professor E. Reynolds, J who found that for its atomic heat to be near the normal number 6⋅0, its atomic weight must be 9⋅2 and not 13⋅8. Almost immediately afterwards a second determination of the specific heat was made by MM. Nilson and Petterson, who, however, obtained a result agreeing not with the lower atomic weight hut with the higher. The reasons for these conflicting opinions are to be found—first, in the anomalous position of glucinum among the elements; secondly, in the difficulties which surround the preparation of even small quantities of the free metal in a tolerably pure condition; and thirdly, in the fact that no volatile compound of glucinum is known of which the vapour density might be easily determined.

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