Serkan Solmaz and Jean-Baptiste Gouriet and Nicolas Van de Wyer and Christophe Schram
Multiphase Flow Regime Detection Algorithm for GasLiquid Interface Using Ultrasonic PulseEcho Technique
90 - 100
2019
13
4
International Journal of Physical and Mathematical Sciences
https://publications.waset.org/pdf/10010263
https://publications.waset.org/vol/148
World Academy of Science, Engineering and Technology
Efficiency of the cooling process for cryogenic
propellant boiling in engine cooling channels on space applications is
relentlessly affected by the phase change occurs during the boiling.
The effectiveness of the cooling process strongly pertains to the
type of the boiling regime such as nucleate and film. Geometric
constraints like a nontransparent cooling channel unable to use
any of visualization methods. The ultrasonic (US) technique as a
nondestructive method (NDT) has therefore been applied almost
in every engineering field for different purposes. Basically, the
discontinuities emerge between mediums like boundaries among
different phases. The sound wave emitted by the US transducer is
both transmitted and reflected through a gasliquid interface which
makes able to detect different phases. Due to the thermal and
structural concerns, it is impractical to sustain a direct contact
between the US transducer and working fluid. Hence the transducer
should be located outside of the cooling channel which results in
additional interfaces and creates ambiguities on the applicability
of the present method. In this work, an exploratory research is
prompted so as to determine detection ability and applicability of
the US technique on the cryogenic boiling process for a cooling
cycle where the US transducer is taken place outside of the channel.
Boiling of the cryogenics is a complex phenomenon which mainly
brings several hindrances for experimental protocol because of
thermal properties. Thus substitute materials are purposefully selected
based on such parameters to simplify experiments. Aside from
that, nucleate and film boiling regimes emerging during the boiling
process are simply simulated using nondeformable stainless steel
balls, airbubble injection apparatuses and air clearances instead
of conducting a realtime boiling process. A versatile detection
algorithm is perennially developed concerning exploratory studies
afterward. According to the algorithm developed, the phases can be
distinguished 99 as nophase, airbubble, and airfilm presences.
The results show the detection ability and applicability of the US
technique for an exploratory purpose.
Open Science Index 148, 2019