Temperature and velocity fields in turbulent liquid flow adjacent to a bubbly boiling layer

Stereo-PIV measurements of vapor-induced flow modifications in confined jet impingement boiling

“…The measurements performed by Roy et al (1993) of liquid turbulence adjacent to the bubbly boundary layer in their annular flow boiling experiment showed that velocity fluctuations outside the bubbly region increased as a result of the vapor formation occurring in the adjacent boundary layer. In an extension of this study, Roy et al (1997) used laser Doppler velocimetry (LDV) to include liquid velocity measurements within the bubbly boundary layer close to the inner heated wall.…”

PTV experiments of subcooled boiling flow through a vertical rectangular channel

“…Some of these changes are general trends observed also in other studies (Roy et al, 1993;Wardana et al, 1994;Lee et al, 2002) and are summarized here: First, the mean liquid axial velocity in regions close to the heated wall increases accompanied with a decrease in the axial velocity for regions far from the heated wall. Second, there is a marked shift of the maximum liquid axial velocity location toward the wall.…”

“…One of the early attempts to measure local fields of subcooled boiling parameters of the liquid phase was performed by Roy et al (1993). They measured turbulent velocity and temperature fields in the all-liquid region adjacent to a subcooled flow boiling layer.…”

A tomographic-PIV investigation of vapor-induced flow structures in confined jet impingement boiling

“…Single-point velocity statistics are useful for determining average properties; however, linking these results to dynamic phase interactions, such as vapor-induced coherent structures, is difficult. Increases in turbulent kinetic energy observed in such two-phase flow studies have been attributed to many different factors including: liquid displacement caused by vapor bubble motion (Lance and Bataille, 1991;Roy et al, 1993), and increased shear stresses caused by the bubble velocity (Theofanous and Sullivan, 1982;Serizawa and Kataoka, 1990). The dominant mechanism for turbulence enhancement due to boiling is not yet clear.…”

“…Vapor bubbles can modify liquid flow paths and act as a source of turbulence (Roy et al, 1993;Roy et al, 1997). One obstacle to implementation of confined two-phase jet impingement is a lack of understanding of the liquid-vapor interactions, particularly as the confinement height is reduced to the small dimensions encountered in compact electronics packaging.…”