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Prediction of the boiling temperature and heat flux in sugar–water solutions under pool-boiling conditions

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Abstract

Condensing of a sugar–water solution is a widely used production process, especially in food industry. In this study, boiling temperature and heat transfer of different concentration levels of sugar/water solution is experimentally studied. In the experiment, the pool boiling with constant temperature difference between surface and boiling temperature is investigated. Boiling point of sugar/water solution depends on sugar mass concentration and on vapor phase pressure. A function is suggested to calculation the boiling temperature. The experimental data and the calculated values of boiling temperature are compared. The results are verified with previous investigations. It is determined that the heat flux between surface and sugar/water solution while pool boiling displays a linear relation with water mass concentration in the solution. Heat transfer coefficient could be determined in dependency of surface temperature and sugar mass concentration. Furthermore a function is suggested to predict the heat flux for engineering purpose, which is already used in similar form for pure substances.

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Abbreviations

A :

surface area, [m2]

c :

concentration, [kg/kg]

c p :

constant pressure specific heat, [kJ/kg K]

C :

consant

g :

gravity, [m/s2]

h :

heat transfer coefficient, [W/(m2 K)]

h :

enthalpy, [kJ/kg]

k :

coefficient, [kW/(m2°C1,3)]

m :

mass, [kg]

Pr :

Prandtl number

q :

heat flux, [W/m2]

Q :

heat, [kJ]

T :

temperature, [°C]

t :

time, [s]

ρ :

density, [kg/m3]

σ :

surface tension, [N/m2]

μ :

kinematics viscosity, [kg/m s]

b:

boiling

f:

fluid

g :

vapor, gas

fg:

difference in property between saturated liquid and saturated vapor

h:

heating

l:

lost

p:

pressure

s:

sugar

sat:

saturation

t:

total

w :

surface, wall

wt:

water

1:

initial

2:

final

n :

constant

S :

Rohsenow consant

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Authors and Affiliations

  1. Department of Mechanical Engineering, Sakarya University, 54187, Sakarya, Turkey

    Mustafa Özdemir & Hüseyin Pehlivan

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  1. Mustafa Özdemir
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  2. Hüseyin Pehlivan
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Correspondence to Mustafa Özdemir.

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Özdemir, M., Pehlivan, H. Prediction of the boiling temperature and heat flux in sugar–water solutions under pool-boiling conditions. Heat Mass Transfer 44, 827–833 (2008). https://doi.org/10.1007/s00231-007-0310-3

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  • DOI: https://doi.org/10.1007/s00231-007-0310-3

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