Superhydrophobic surfaces can entrap gas pockets within their grooves when submerged in water. Such a mixed-phase boundary is shown to result an effective slip velocity on the surface, and has promising potential for drag reduction energy-saving hydrodynamic applications. The target flow regime, most such applications, turbulent flow. Previous analyses of this problem involved direct numerical simulations turbulence with superhydrophobic surface modelled as flat boundary, but heterogeneous...

Superhydrophobic surfaces can significantly reduce hydrodynamic skin drag by accommodating large slip velocity near the surface due to entrapment of air bubbles within their micro-scale roughness elements. While there are many Stokes flow solutions for flows superhydrophobic that describe relation between effective length and geometry, such relations not fully known in turbulent limit. In this work, we present a phenomenological model kinematics with periodic post-patterns at high Reynolds...

Superhydrophobic surfaces can retain gas pockets within their microscale textures when submerged in water. This property reduces direct contact between water and solid presents opportunities for improving hydrodynamic performance by decreasing viscous drag. In most realistic applications, however, the flow regime is turbulent retaining a challenge. order to overcome this challenge, it crucial develop an understanding of physical mechanisms that lead failure superhydrophobic overlying liquid...

A formulation is developed to apply the two-layer k−ε model rough surfaces. The approach involves modifying lν formula and boundary condition on k. hydrodynamic roughness length introduced related geometrical through a calibration procedure. An experiment has been conducted test model. It provides data flow over ramp with without surface roughness.

Abstract Cardiovascular simulations are increasingly used for noninvasive diagnosis of cardiovascular disease, to guide treatment decisions, and in the design medical devices. Quantitative assessment variability simulation outputs due input uncertainty is a key step toward further integration clinical workflow. In this study, we present quantification computational models coronary circulation investigate effect uncertain parameters, including pressure waveform, intramyocardial pressure,...

Percutaneous medical devices are preferred for the treatment of cardiovascular diseases due to their minimal intervention compared surgery. However, complications such as thrombosis remain significant challenges. This study aims investigate hemodynamic effects slip surfaces on pacemaker leads and coronary stents using computational fluid dynamics under physiological conditions. Two models were developed: a venous anatomical model with lead artery stent. Slip boundary conditions applied these...

Superhydrophobic surfaces demonstrate promising potential for skin friction reduction in naval and hydrodynamic applications. Recent developments of superhydrophobic aiming scalable applications use random distribution roughness, such as spray coating etched process. However, most previous analyses the interaction between flows studied periodic geometries that are economically feasible only lab-scale experiments. We conduct direct numerical simulations turbulent over randomly patterned...

Numerical models are increasingly used for noninvasive diagnosis and treatment planning in coronary artery disease, where service-based technologies have proven successful identifying hemodynamically significant hence potentially dangerous vascular anomalies. Despite recent progress towards clinical adoption, many results the field still based on a deterministic characterization of blood flow, with no quantitative assessment variability simulation outputs due to uncertainty from multiple...

BACKGROUND:Neck pain is associated with computer work, poor posture, imbalanced neck muscles, and fatigue, particularly in office workers. This study from a single center aimed to compare the effects of thoracic spine mobility exercise manipulation improve cervical range motion 26 workers who had chronic for more than 12 weeks. MATERIAL AND METHODS:The participants were lasting >12 These randomly assigned undergo TSME (n=13) or TSM (n=13). Both groups underwent joint mobilization deep flexor...

Bond slip of RC structures occurs wherever primary cracks are present. These usually appear at the beam-column and column-foundation joints, for example, when subjected to seismic loadings. As a result, it is imperative consider bond in performing an accurate evaluation response structures. The distributions stress strain embedded rebar vary depending on geometry, such as concrete cover embedment length, which referred here configuration effects. Because can be defined functions rebar,...

Abstract The pandemic coincided with rapid advancements in virtual reality (VR) and mixed (MR) healthcare. idea of virtually replicating the real world its associated experiences has garnered significant attention under newly coined term “metaverse.” metaverse serves as a communication platform that integrates physical experiences. However, lack interaction between users environments remains an obstacle. This study introduces hybrid upper‐arm‐geared exoskeleton system combines anatomical...

본 연구에서는 기존 레일용접부 직진도 검사 시스템의 레일 물성변화(재질, 온도변화)에 따른 측정오차가 발생하는 단점을 보완하기 위해 와전류 및 레이저 센서간의 차이점을 분석하고 기반의 시스템을 개발하였다. 시스템과의 프로그램 현장측정을 통해 시스템 검증을 실시하였고 동일한 분석값을 도출하여 성능 완료하였다. 또한, 개발 레일표면 품질지수 QI 값을 계산할 수 있는 1차식을 도출하였으며, 측정 정밀도 향상을 데이터를 0.5mm로 수집하고 표면 미세 형상변화 측정과 이외의 표면결함을 부가적으로 측정할 연구를 진행하였다.

After an arterial switch operation for complete transposition of the great arteries, neo-aortic root dilatation occurs, with unclear hemodynamic effects. This study analyzes three groups (severe dilation, mild and normal) using computational fluid dynamics (CFD) on cardiac CT scans. Aortic arch angles in severe (median 72.3, range: 68.5-77.2) dilation (76.6, 71.1-85.2) are significantly smaller than normal group (97.3, 87.4-99.0). In groups, Wall Shear Stress (WSS) exhibits a consistent...

Background Pediatric patients with aneurysms due to Kawasaki disease require life-long and uninterrupted cardiology follow-up. Current AHA guidelines for risk stratification long-term management are based primarily on maximal coronary artery luminal dimensions, normalized as Z-scores. Hemodynamic functional significance of arteries myocardial ischemic is not well studied. Methods We retrospectively studied a cohort 15 who underwent CT angiography imaging. constructed patient-specific...

We present physics-based nozzle design rules to achieve high-throughput and stable jetting in drop-on-demand liquid metal 3D printing. The are based on scaling laws that capture the change of meniscus oscillation relaxation time with geometric characteristics nozzle's inner profile. These include volume, cross-sectional area, surface area nozzle. Using boundary layer theory for a simple geometry, we show settles faster when ratio volume is increased. High-fidelity multiphase flow simulations...

Numerical models are increasingly used for non-invasive diagnosis and treatment planning in coronary artery disease, where service-based technologies have proven successful identifying hemodynamically significant hence potentially dangerous vascular anomalies. Despite recent progress towards clinical adoption, many results the field still based on a deterministic characterization of blood flow, with no quantitative assessment variability simulation outputs due to uncertainty from multiple...