The two-phase ejector, shown in Fig. 2, is designed in
three main parts: the motive nozzle, the suction chamber,
and the mixing chamber with diffuser. The motive nozzle
throat area is designed according to the Henry and Fauske
model [6]. This model is used because it considers the
metastable effect of the expansion of saturated liquid into
the liquid–vapor mixture region. The remaining crosssectional
areas of the ejector are designed according to the
homogeneous equilibrium model (HEM) [1,7]. HEM is
based on the assumption that vapor and liquid are in thermal
and mechanical equilibrium. Furthermore, the mixing
process is assumed to occur at constant pressure. The
other dimensions, including the lengths of each section and
the convergent and divergent angles, are based on
recommendations from the ASHRAE Handbook [8] and
from Nakagawa et al. [5]. The detailed drawing of the tested
motive nozzle is shown in Fig. 3.