In the present study, a variety of problems of conjugate heat transfer considering natural convection were analyzed. In chapter Ⅱ, a three-dimensional numerical study on flow pattern in winter along connecting passageway of a composite building was ...
In the present study, a variety of problems of conjugate heat transfer considering natural convection were analyzed. In chapter Ⅱ, a three-dimensional numerical study on flow pattern in winter along connecting passageway of a composite building was conducted using a commercial CFD package. The incompressible Navier-Stokes equation coupled was solved by using SIMPLE algorithm in order to find steady solutions. It was shown that a upward flow is generated inside the building in winter due to buoyancy effect and that the air inside connecting passageway flows form the shorter building to the taller one regardless of the slope of the passageway. Further, it was found that the magnitude of air velocity inside connecting passageway increases, although the variation in the magnitude of fluid velocity is not substantial. Lastly, it was shown that the maximum air velocity inside connecting passageway is less than the allowable limit for all the cases considered in this study.
In chapter Ⅲ, a conjugate heat-transfer problem in indirect moxibustion was analyzed by solving the problem of unsteady convective heat transfer coupled with conductive heat transfer. The interaction of a combustion-heated paper disk of moxa with the body and surrounding fluid was revealed by examining the body's unsteady temperature distributions. From the grid- and time step-independent solutions to the present conjugate heat-transfer problem, the effective stimulation periods for four widths of paper disk, along with the depths of the effective stimulation zones, were obtained. Further, it was found that the effective stimulation zone becomes larger and lasts longer for the wider paper disks, whereas the depth of the effective stimulation zone is saturated beyond a certain size. Lastly, the streamline pattern and the history of the spatially averaged heat-transfer coefficient, which is related to the convective heat transfer between the body and the surrounding fluid, were determined.
In chapter Ⅳ, a conjugate heat transfer problem of heating disk was investigated by solving the steady convective heat transfer problem coupled with the conduction heat transfer. The interaction of the heating disk with the body and surrounding fluid was examined by solving the Pennes bioheat equation coupled with the incompressible Navier-Stokes equations. From the present conjugate heat transfer analysis, the effect of blood perfusion rate and temperature of heating disk on the temperature distribution of the body was investigated. Lastly, the streamline pattern and the history of the spatially averaged heat-transfer coefficient, which is related to the convective heat transfer between the body and the surrounding fluid, were determined.