@Article{SebastiãoSant:2014:ImSuDi,
author = "Sebasti{\~a}o, Israel Borges and Santos, Wilson Fernando Nogueira
dos",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "Impact of surface discontinuities on flowfield structure of a
micronozzle array",
journal = "Nanoscale And Microscale Thermophysical Engineering",
year = "2014",
volume = "18",
number = "1",
pages = "54--79",
month = "Jan.",
keywords = "DSMC, rarefied flow, MEMS, micronozzle, supersonic flow.",
abstract = "This work carries out two-dimensional numerical simulations of
rarefied gas flow in convergent-divergent micronozzles. Such a
device is considered part of a micronozzle array. Although
previous studies have investigated micronozzles with continuous
divergent surfaces, the present work evaluates the impact of the
surface smoothness on the flowfield structure by including
discontinuities on the divergent contour. Such a scenario was not
previously investigated. As a secondary goal, detailed physical
explanations are given for those flow features reported but not
extensively discussed in previous micronozzle studies. A direct
simulation Monte Carlo method is employed to describe these flows
due to the moderate rarefaction degree typically observed in
microdevices. The results pointed out the sensitivity of the
macroscopic propertiesvelocity, pressure, and temperaturedue to
the geometric variations on the divergent surface. In addition,
Knudsen number distributions are computed to map nonequilibrium
flow regions. The results indicated that the proposed surface
discontinuities do not play the main role in the investigated
micronozzle flows. This finding was not previously reported for
micronozzle flows and contradicts the expected behavior in
macroflows, where shock waves and/or expansion waves arise in
supersonic flows experiencing abrupt changes in the flow
direction.",
doi = "10.1080/15567265.2013.840344",
url = "http://dx.doi.org/10.1080/15567265.2013.840344",
issn = "1556-7265 and 1556-7273",
label = "isi 2014-05 SebastiaoSant:2014:IMSUDI",
language = "en",
urlaccessdate = "25 abr. 2024"
}