Development of simple capacitance and diode based void fraction sensors for cryogenic two phase flow

This paper deals with the development of capacitance and diode-based void fraction measurement sensors for cryogenic two-phase flow in a flexible cryogenic transfer line (20.5 mm ID and 3 mm long) designed and fabricated in-house. Most of the capacitance sensors are prepared on the inner glass tube. These sensors can be subjected to breakages while handling and also making end connections for these sensors are not easy. So, an attempt has been made to develop void fraction sensors by avoiding glass tubes. Simple capacitance and diode-based sensors are designed and calibrated for experimental studies on two-phase flow. Numerical analysis has also been done for liquid nitrogen (LN2) and nitrogen gas (N2) flows in the transfer line using ANSYS fluent software and validated with experimental results.