Heat transfer correlation of the falling film evaporation on a single horizontal smooth tube

Experience on horizontal‐tube falling‐film evaporation simulation by lattice‐Boltzmann method

“…The profile of local heat transfer coefficients in Figure shows that decreases with increasing . The change in coefficient with respect to the circumferential angle is in agreement with predictions, experimental, and numerical results . Flow field affects the heat transfer performance through the velocity vectors and film thickness.…”

“…and ω α is the weight factor determined from lattice structure. Since all three particle distribution functions of current study are in the D Q 2 9 system, the weight factors are ω = 4/9 0 , ω = 1/9 1,2,3,4 , and ω = 1/36 5,6,7,8 . Moreover, because this model concentrates on the phase change in the low Mach number and incompressible limits of the fluid flow, by ignoring the pressure work and heat dissipation, the simple passive scalar approach is applied for the evolution of the temperature field inside the computational domain.…”

“…Roques et al showed that uncertainty in experiments and measurement greatly affects the results. Zhao et al concluded that the simulation of two‐phase flows with dynamic interfaces is still a challenging task and further studies are highly required for understanding the whole process. Among the related studies, those by Fletcher et al and Chyu and Bergles on a single horizontal tube have the most similar conditions to the present study because of the considered range of parameters.…”

A numerical study of condensation heat transfer for R-134a in annular flow regime inside horizontal tube

“…The length and diameter of the tube were 1.2 m and 8.5 mm. Refrigerant R134a selected at a saturated temperature 40 C. Fluid properties were taken from Reference Fluid Thermodynamic and Transport Properties Data Base (REFROP) software as seen in Table 1 [11]. …”

“…Solution method used a coupled scheme as Pressure-Velocity coupling [2]. Boundary conditions of the horizontal tube are the Mass-flow inlet, outlet pressure, and adiabatic wall [11]. Spatial Discretization of pressure was standard, while the momentum of turbulent kinetic energy, specific energy dissipation rate were second order upwind [2].…”