  Unlike solids, the heat transfer in fluids can be greatly enhanced due to the
presence of convection. Under gravity, an unevenly distributed temperature
field results in differences in buoyancy, driving fluid motion that is seen in
Rayleigh-B\'enard Convection (RBC). In RBC, the overall heat flux is found to
have a power-law dependence on the imposed temperature difference, with
enhanced heat transfer much beyond thermal conduction. In a bounded domain of
fluid such as a cube, how RBC responds to thermal perturbations from the
vertical sidewall is not clear. Will sidewall heating or cooling modify flow
circulation and heat transfer? We address these questions experimentally by
adding heat to one side of the RBC. Through careful flow, temperature, and heat
flux measurements, the effects of adding side heating to RBC are examined and
analyzed, where a further enhancement of flow circulation and heat transfer is
observed. Our results also point to a direct and simple control of the
classical RBC system, allowing further manipulation and control of thermal
convection through sidewall conditions.
