Attached
Liquid-liquid slug flow in microchannels can increase the heat transfer rates due to the
internal recirculation within the liquid slugs. This paper presents experimental studies o f heat transfer
enhancement in microchannels with liquid-liquid slug flow. The experimental studies are carried out
using a stainless steel channel with a circular cross section. Water is used as the dispersed phase fluid
while silicon oil is used as the primary phase. The channel is heated by Joule heating. Two-phase
flow is formed using a T-junction o f 1 mm circular channels made using PDMS, and a specific
channel arrangement was designed in the outlet channel in order to avoid the flow disruption when
introducing the flow to the steel tube. The flow visualization is carried out with a Phantom V1610
camera and flow is visualized at both before and after the steel tube to ensure the required flow is
passing through the tube. Experimental results showed over 400% increase in heat transfer with
liquid-liquid slug flow compared to its single phase counterpart.
