Spontaneous imbibition is a capillary-driven flow phenomenon that exists widely in nature and important for several industries. Recently, Tolman length has been introduced to improve the classical Lucas-Washburn model, order alleviate deviations calculating capillary pressure. However, experiments measure have scarce. In addition, fluid-wall friction considerable impact on process, while it oft...

A circular tube fitted with novel corrugated spring tape inserts has been investigated. Air was used as the working fluid. thorough literature review done and this geometry not studied previously, neither experimentally nor theoretically. experimental investigation of enhanced can, therefore, be treated a new substantial contribution in open literature. Three different ratio depth study. Increa...

The internal flow in corrugated tubes of different helical pitch, covering from the laminar to turbulent regime, was studied order characterize three-dimensional and influence corrugation geometry on pressure drop convective heat transfer. With water as working fluid an imposed wall flux, ranging around 4 33 kW/m2, a numerical model developed with CFD commercial software, where k?? SST used tur...

In this paper we present a new model for calculating the capacitance of MEMS sensor with corrugated diaphragm. In this work the effect of residual stress is considered on deflection of diaphragm and capacitance of sensor. First, a new analytical analyzes have been carried out to derive mathematic expressions for central deflection of corrugated diaphragm and its relationship with residual stres...

In this article, the performance of double corrugated tubes applied in a tube-in-shell heat exchanger is analysed and compared to equipped with straight tubes. The CFD (computational fluid dynamics) analysis was performed considering turbulent flow regime at several mass rates. It observed that geometry does not have significant impact on pressure drop inside exchanger, while it has potential i...

In this study the effects of corrugated absorber plate and using aerosol-carbon black nanofluid on heat transfer and turbulent flow in solar collectors with double application and air heating collectors, were numerically investigated. The two-dimensional continuity, momentum and energy equation were solved by finite volume and SIMPLE algorithm. In the present investigation all the simulations w...

Based on the hypothesis that multi-corner and multi-cell structures can effectively improve energy absorption behavior, this paper designed a circumferentially corrugated tube (MCCT) for absorption. The MCCT was as variable thickness form to study influence of materials distribution cross section performance investigated under impact condition with finite element simulation validated by drop ha...