scholarly journals Effect of Dehydration on the Rheological Measurement of Surimi Paste in Cone-Plate Rheometry: Heat and Mass Transfer Simulation

Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 234
Author(s):  
Hyeon Woo Park ◽  
Jae Won Park ◽  
Won Byong Yoon
Keyword(s):  
Moisture Content ◽  
Simulation Model ◽  
Heating Rate ◽  
Moisture Transfer ◽  
Moisture Diffusivity ◽  
Heat Transfer Characteristics ◽  
Heating Rates ◽  
Rheological Measurement ◽  
Transfer Characteristics ◽  
Mass And Heat Transfer

Moisture transfer characteristics of Alaska pollock (AP) surimi were investigated at various temperatures. The effective moisture diffusivity increased from 5.50 × 10−11 to 2.07 × 10−9 m2/s as the temperature increased from 30 °C to 90 °C. In order to investigate the mass and heat transfer characteristics of AP surimi, the simulation model was developed and evaluated by root-mean-square error (RMSE) (<2.95%). Rheological properties of AP surimi were investigated at different heating rates (1 °C/min, 5 °C/min, 10 °C/min, 20 °C/min and 30 °C/min). As heating rate increased to 20 °C/min and 30 °C/min, elastic modulus (G’) significantly diminished. The diminished G’ could be explained by impaired gel during temperature sweep supported by the predicted temperature distribution in the simulation model. Changes in moisture content of AP surimi during temperature sweep were also measured and predicted by the simulation model. The results showed the decreased amount of moisture content significantly increased as heating rate increased.

Mass and heat transfer characteristics of layered-plates type regenerator

2000 ◽  
Vol 2000.4 (0) ◽  
pp. 165-168 ◽  
Author(s):  
Kento DOAMI ◽  
Masatoshi SHINOKI ◽  
Kensuke AKAMATU ◽  
Mamoru OZAWA
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Characteristics ◽  
Layered Plates ◽  
Transfer Characteristics ◽  
Mass And Heat Transfer

Climate Variables That Influence the Thermal Performance of Horizontal Collector Ground Source Heat Pumps

2006 ◽  
Author(s):  
John Lohan ◽  
Niall Burke ◽  
Michael Greene
Keyword(s):  
Heat Transfer ◽  
Soil Moisture ◽  
Moisture Content ◽  
Heat Pump ◽  
Soil Moisture Content ◽  
Heat Pumps ◽  
Operating Conditions ◽  
Climate Variables ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics

The performance characteristics of new heat pumps are usually evaluated under standard test conditions in certified test laboratories prior to their market release. While this data allows potential customers an opportunity to compare different heat pumps under the same conditions it is difficult to assess how variations in operating conditions, particularly around horizontally oriented ground collectors impact on heat pump Coefficient Of Performance (COP). Indeed, harsh winter conditions of continental climates dictate that horizontal collectors are buried sufficiently deep enough to operate in a thermally stable environment, independent of the weather, but this is not as critical in milder maritime climates and shallower collectors that may be influenced by climate are used. This review paper therefore seeks to identify the key climate variables that have been shown to influence the efficiency of horizontal collector heat pump systems. The literature highlights the significant impact of soil moisture content on COP, but the extended relationship between climate, moisture content and COP has not been established. Historical climate data from both a continental and maritime climate is presented and key aspects of their respective weather patterns are compared to assess their capacity to influence soil condition and COP. A series of empirical models linking changes in soil moisture content to fluctuations in soil thermal conductivity, diffusivity and resistance are also presented so that the impact of climate on soil thermal energy content and heat transfer characteristics might be assessed. However, since no one study has experimentally determined the complex relationship between climate, soil heat transfer characteristics and heat pump performance, this paper concludes with an overview of an experimental test facility that allows this relationship to be established for horizontal collector heat pumps in maritime climates.

Application of moisture transfer models to solids drying

2005 ◽  
Vol 219 (3) ◽  
pp. 235-244 ◽  
Author(s):  
E Kavak Akpinar ◽  
I Dincer
Keyword(s):  
Moisture Content ◽  
Moisture Transfer ◽  
Moisture Diffusivity ◽  
Drying Process ◽  
Drying Time ◽  
Air Temperatures ◽  
Moisture Transfer Coefficient ◽  
Drying Models ◽  
Good Agreement ◽  
Flow Velocities

In this paper, a comprehensive experimental investigation is conducted to measure the moisture content distributions within slab cut potato pieces during drying at temperatures of 60, 70, and 80°C and flow velocities of 1.0 and 1.5 m/s. Four drying models are employed to determine the drying process parameters (drying coefficient, lag factor, and half-drying time) and moisture transfer parameters (moisture diffusivity and moisture transfer coefficient), and to calculate moisture content distributions and compare them with extensive sets of experimental moisture data measured during the drying of slab cut potato slices at different drying air temperatures and flow velocities. Good agreement is obtained between the calculations and experimental measurements for the cases. In addition, experimental drying times are determined and compared with those obtained by the four different drying models. The results show that all four models are well able to determine the drying parameters and moisture content distributions. The experimental data and model findings are expected to be useful to the drying industry.

STATISTICAL MODEL OF INTERNAL MOISTURE TRANSFER FOR DRYING OF POTATO IN CIRCULATING FLUIDIZED BED

2019 ◽  
Author(s):  
А.В. МИТРОФАНОВ ◽  
В.Е. МИЗОНОВ ◽  
Е.А. ШУИНА ◽  
И.А. ТИХОМИРОВА
Keyword(s):  
Moisture Content ◽  
Statistical Model ◽  
Fluidized Bed ◽  
Moisture Transfer ◽  
Circulating Fluidized Bed ◽  
Initial Moisture Content ◽  
Moisture Diffusivity ◽  
Regression Equation ◽  
Diffusivity Coefficient ◽  
Constant Diffusivity

Исследованы параметры процесса сушки картофельных цилиндров в циркуляционном кипящем слое при различных температурных режимах. Эксперименты выполнены при температурах сушильного агента 30, 35, 40, 45°С и фиктивной скорости ожижающего воздуха 8,0 м/с. Начальное влагосодержание материала составило 4,15 кг/кг, влагосодержание в конце обработки (0,20 ± 0,05) кг/кг. Предлагаемая статистическая модель основана на аналогии между главным членом численного решения уравнения диффузии методом Кранка-Николсон и уравнением регрессии для относительного влагосодержания материала. Коэффициент эффективной диффузии получен в диапазоне 7,402 · 10–9 м2/с и 8,626 · 10–9 м2/с. Предложено уравнение регрессии для коэффициента диффузии в форме зависимости Аррениуса с предэкспоненциальным множителем 1,91 · 10–7 м2/с и энергией активации 8,18 кДж/моль. The parameters of the drying process of potato cylinders in the circulating fluidized bed at different temperature conditions are investigated. The experiments were performed at the temperatures of the drying agent 30, 35, 40, 45°C and the fictitious speed of the liquefying air 8,0 m/s. The initial moisture content of particles was about 4,15 kg/kg and the final moisture content was in range (0,20 ± 0,05) kg/kg. The proposed statistical model is based on the analogy between the main term of the numerical solution of the diffusion equation by the Crank–Nicolson method and the regression equation for the relative moisture content of the material. Effective moisture diffusivity of the potato particles varied between 7,402 · 10–9 m2/s and 8,626 · 10–9 m2/s. The regression equation for moisture diffusivity coefficient were obtained in form of Arrhenius relationship with the constant diffusivity basis equal 1,91 · 10–7 m2/s and the activation energy equal 8,18 kJ/mol.

Sign in / Sign up

Export Citation Format

Share Document