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Experiments are conducted in a two-dimensional mono-layer vibrofluidized bedof glass beads, with a goal to understand the transition scenario and theunderlying microstructure and dynamics in different patterned-states. At smallshaking accelerations ($\Gamma=A\omega^2/g <1$), the particles remain attachedwith the base of the vibrating container -- this is known as the solid bed(SB). With increasing $\Gamma$ (at large enough shaking amplitude $A/d$) and/orwith increasing $A/d$ (at large enough $\Gamma$), the sequence oftransitions/bifurcations unfolds as follows: SB to BB ("bouncing bed") to LS("Leidenfrost state") to "2-roll Convection" to "1-roll Convection" and finallyto a gas-like state. For a given length of the container, the coarsening ofmultiple convection rolls leading to the genesis of a "single-roll" structure(dubbed the {\it multi-roll transition}), and its subsequent transition to agranular-gas are two novel findings of this work. We show that the criticalshaking intensity ($\Gamma_{BB}^{LS}$) for "$BB\to LS$"-transition has apower-law dependence on the particle loading ($F=h_0/d$, where $h_0$ is thenumber of particle layers at rest and $d$ is the particle diameter) and theshaking amplitude ($A/d$). The characteristics of $BB$ and $LS$ states arestudied by calculating (i) the coarse-grained density and temperature profilesand (ii) the pair correlation function. It is shown that while the contactnetwork of particles in the BB represents a hexagonal-packed structure, thecontact network within the LS resembles a liquid-like state. An unsteadiness ofthe LS has been uncovered wherein the interface (between the floating-clusterand the dilute gas underneath) and the top of the bed are found to oscillatesinusoidally, with its oscillation frequency closely matching with thefrequency of external shaking.

Pattern-transition, microstructure and dynamics in two-dimensional vibrofluidized granular bed