Abstract
Aims: In this study, the physical and rheological properties of three poly-floral honey
samples collected from different places in the Kurdistan region were determined.
Methods: The honey samples were analyzed for pH, free acidity, total ash content, moisture content,
refractive index, soluble solids (Brix), electrical conductivity, volume expansion, density, specific
heat capacity, surface tension, and rheological properties. The pH and free acidity of the honey
samples varied from 4.10 to 4.81 to 30 to 62 mEq/kg, respectively. The total ash content ranged
from 0.166 to 0.408%. The moisture content, soluble solids, and refractive index ranged from
15.60 to 16.60 g/100 g, 83.40 to 84.40, and 1.4998 to 1.5023, respectively. The electrical conductivity
ranged from 40.896 to 44.471 mS/cm. The linear relationship between the electrical conductivity
and the ash content was also calculated in this investigation. The volumetric expansion coefficient
of the honey samples varied from 6.0098x10-4 to 6.69942x10-4 mm3/K. The density ranged
from 1.42125995 to 1.45501137 g/cm3. The specific heat capacity varied from 2448.078 to
2575.004 J/kg.K. The surface tension varied from 0.2178 to 0.2282 N/m. The apparent viscosity
was measured by Brookfield Viscometer, and the dynamic viscosity was measured by HAAKE
Falling Ball Viscometer, after changing the temperature from 293 to 323 K.
Results and Discussion: The honey samples of lower moisture content showed a greater increase
in their apparent and dynamic viscosities. Arrhenius model was used to describe the effect of temperature
on the honey viscosity. This model was used to determine the activation energy. Other rheological
properties such as kinematic viscosity and fluidity, were also determined.
Conclusion: All the honey samples behaved as Newtonian fluids in the whole temperature range.
Keywords:
Poly-floral honey, rheological properties, viscosity, specific heat capacity, surface tension, newtonian fluids.
Graphical Abstract
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