  Dripping, jetting and tip streaming have been studied up to a certain point
separately by both fluid mechanics and microfluidics communities, the former
focusing on fundamental aspects while the latter on applications. Here, we
intend to review this field from a global perspective by considering and
linking the two sides of the problem. In the first part, we present the
theoretical model used to study interfacial flows arising in droplet-based
microfluidics, paying attention to three elements commonly present in
applications: viscoelasticity, electric fields and surfactants. We review both
classical and current results about the stability of jets affected by these
elements. Mechanisms leading to the breakup of jets to produce drops are
reviewed as well, including some recent advances in this field. We also
consider the relatively scarce theoretical studies on the emergence and
stability of tip streaming flows. In the second part of this review, we focus
on axisymmetric microfluidic configurations which can operate on the dripping
and jetting modes either in a direct (standard) way or via tip streaming. We
present the dimensionless parameters characterizing these configurations, the
scaling laws which allow predicting the size of the resulting droplets and
bubbles, as well as those delimiting the parameter windows where tip streaming
can be found. Special attention is paid to electrospray and flow focusing, two
of the techniques more frequently used in continuous drop production
microfluidics. We aim to connect experimental observations described in this
section of topics with fundamental and general aspects described in the first
part of the review. This work closes with some prospects at both fundamental
and practical levels.
