We study nucleate pool boiling in water at saturation temperature and ambient pressure under low heat fluxes. A combination
of high-speed and spatially-resolved diagnostic tools are developed and applied to provide detailed insight into the flow and
heat transfer mechanisms during bubble life cycle. Two fluorescent dyes with non-overlapping spectra are seeded into the
water and are excited by a Nd:YLF laser sheet at 527 nm. A two-colour laser-induced fluorescence method is employed
to individually track the fluorescence of each dye by connecting two cameras, equipped with separate optical filters, to a
beamsplitter and a lens. Tracer particles are also introduced in the water to perform simultaneous particle image velocimetry
measurements. Finally, synchronised high-speed infrared thermometry is conducted to acquire the surface temperature field
over the heater. The links between the interfacial/bubble dynamics, flow and heat transfer are investigated. Superheated liquid
from the thermal boundary layer adjacent to the heater is displaced upwards, due to the growth and departure of the bubbles.
Two counteracting vortices form on each side of the bubbles during their departure and rise, which contribute to the scavenging
and mixing of the bulk water, resulting in a trail of superheated liquid below them.