کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6403235 1330893 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Relationship between the thermal conductivity and rheological behavior of acerola pulp: Effect of concentration and temperature
ترجمه فارسی عنوان
رابطه بین هدایت حرارتی و رفتار رئولوژیکی خمیر آکرولا: اثر غلظت و دما
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش تغذیه
چکیده انگلیسی


- The structure and particle size of acerola pulps was analyzed.
- The Herchel-Bulkley model was used to determine rheological parameters.
- Apparent viscosity was correlated with temperature by the Arrhenius equation.
- Thermal conductivity values were estimated by the model of Maxwell-Eucken.
- Equations expressing conductivity as a function of apparent viscosity was proposed.

This study aimed to evaluate the thermal conductivity and rheological behavior of acerola pulp at concentrations of 5.5, 7.5, 9.5, 11.5 and 13.5 °Brix and temperatures of 20, 30, 40, 50 and 60 °C. Among the models used to determine conductivity, Maxwell-Eucken was used for data acquisition. Linear equations were fitted to evaluate the influences of concentration and temperature on the thermal conductivity of the pulp. The pulp structure, particle sizes and relation between insoluble and soluble solids were also discussed. The rheological behavior, specifically apparent viscosity versus shear rate, was influenced by both the soluble solids content and the temperature. Among the mathematical models used to test the fit of the experimental data, the Herschel-Bulkley model provided the best statistical adjustments and was then used to determine the rheological parameters. Apparent viscosity was correlated with temperature by the Arrhenius equation. Acerola pulps were shear thinning and thermal conductivity increases with viscosity decreasing with increasing temperature. The structures and concentrations had an impact upon the effective thermal conductivity. The temperature and concentration values have been fixed and equation expressing conductivity as a function of apparent viscosity was proposed, which enable the evaluation of an existing relationship between the two properties.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: LWT - Food Science and Technology - Volume 58, Issue 2, October 2014, Pages 446-453
نویسندگان
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