Short-channel structures of triangular and sinu-
soidal channel cross-sectional shape were examined exper-
imentally to find their heat (or mass) transfer and
flow friction (flow resistance) characteristics. A particular
emphasis was placed on influence of the channels length
(referred to its hydraulic diameter) on transport and hydro-
dynamic characteristics. The transport and friction proper-
ties were correlated in terms of dimensionless channel
length with satisfactory accuracy. The dimensionless
channel length was proved to be a key factor that determines
the transport and friction coefficients. Comparison with
ceramic monolith has shown possibility of using the struc-
tures in automotive catalytic converters.