  It has recently been shown that in one-dimensional hard-point gases, there is
a mechanism that induces negative differential thermal resistance (NDTR)
between heat baths. We examine this mechanism in more general higher
dimensional fluids described by multiparticle collision dynamics. We consider
fluids in a finite cuboid region of three-dimensional space with each end in
contact with a heat bath. Based on analytical results and numerical models, we
find that the mechanism underlying NDTR also works for high-dimensional fluidic
systems with weak interactions and is very robust to mixed fluids. Our results
significantly advance knowledge of NDTR induced by heat bath and illuminate new
directions to explore in fabricating fluid thermal transistors in micro- and
nanosystems.
