A Scraped Surface Heat Exchanger (SSHE) is used in the heating of fluids which have high viscosity, high
affinity to deposition and sensitive to thermal changes. The behavior of fluid flow at the stator surface and
around the blades are studied in this paper. We aim to design a suitable type of blade and achieve a high
efficiency by using appropriate boundary condition on stator surface. Finite volume method (FVM) is
used to discretize the governing equations and SIMPLE algorithm is used for pressure-velocity coupling.
The flow around two types of blade, inclined and vertical, is simulated. The results showed suitable conformity with the experimental results. A new type of blade is proposed to improve surface cleaning and
turbulence intensity. In comparison with two other blades, the new blade results in a larger heat transfer
rate and higher efficiency. Also, the boundary condition effects on the heat transfer coefficient are studied
by using three boundary conditions at the stator surface. It is found that a variable heat flux with a linear
increase along the heat exchanger will give the best results
