Provided are embodiments for a computer-implemented method, system, and device for tracking multiphase flow in a microfluidic device. Embodiments include receiving first readings from a first sensor of the microfluidic device, the first reading representing a detection of a fluid at an interface between the fluid and the first sensor, and receiving second readings from a second sensor of the microfluidic device, the second readings representing a detection of the fluid at an interface between the fluid and the second sensor, wherein the first sensor is located at a distance from the second sensor. Embodiments also include calculating a flow speed of the fluid in the microfluidic device based at least in part on a difference of time between the detections by the first sensor and the second sensor, and the distance between the first sensor and the second sensor.