The force-depth behavior of indentation into fibrillar-structured surfaces such as those consisting of forests of microor nanoscale tubes or rods is a depth-dependent behavior governed by compression, bending, and buckling of the nanotubes. Using a micromechanical model of the indentation process, the effective elastic properties of the constituent tubes or rods as well as the effective propert...

Two-phase frictional pressure drop data were obtained for condensation of carbon dioxide in single horizontal micro tube of inner diameter ranged from 0.6 mm up to 1.6 mm over mass flow rates from 2.5*10 to 17*10 kg/s and vapor qualities from 0.0 to 1.0. The inlet condensing pressure is changed from 33.5 to 45 bars. The saturation temperature ranged from -1.5 C up to 10 C. These data have then ...

This paper investigates axial compression process of multi-layered tubes with circular cross-section under the axial loading in the quasi-static condition using experimental method. Some specimens are prepared in seven different groups, namely; empty carbon/epoxy composite tubes, solid carbon/epoxy composite rods, empty copper tubes, composite tubes with silicon sealant filler, concentrically s...

This review study examines flow boiling heat transfer in micro-fin tubes using mixed and pure refrigerants with zero ozone-depleting potential (ODP) minimal global warming (GWP). investigation focuses on the extraordinary relationship between coefficients (HTCs) vapor quality. Since introduction of exchanger over 30 years ago, refrigerant-based cooling has improved significantly. Air conditioni...

Background: Infection is a vital problem in intensive care units. Currently, chlorhexidine solution is used to reduce oral colonization. This study aimed to determine the efficacy of chlorhexidine solution on oropharyngeal bacterial colonization in hospitalized patients in the intensive care units. Methods: This descriptive study (from August 2018 to May 2019) was performed on 60 patients who ...