scholarly journals FlowHaptics: MidairHaptic Representation of Liquid Flow

2021 ◽  
Vol 11 (18) ◽  
pp. 8447
Author(s):  
Photchara Ratsamee ◽  
Yusuke Orita ◽  
Yoshihiro Kuroda ◽  
Haruo Takemura
Keyword(s):  
Velocity Profile ◽  
Pressure Distribution ◽  
Flow Velocity ◽  
Dimensional Space ◽  
Subjective Evaluation ◽  
Fluid Simulation ◽  
Flowing Water ◽  
Air Jets ◽  
Distribution Change ◽  
Temporal Pressure

Water is an essential substance for humans in their daily lives. There are many opportunities for us to come in contact with water, such as cooking, bathing, and swimming. However, few studies have reproduced the sensation of water touching the skin. This study aims to propose a novel midair haptic device, named FlowHaptics, that reproduces the feeling of the force of flowing water over human fingers using multiple air jets. We first estimated the temporal pressure distribution change of water in two-dimensional space using machine-learning-accelerated fluid simulation. We controlled the airflow based on the pressure distribution change obtained from the fluid simulation to reproduce the feeling of flowing water over the fingers using our proposed device, which can control multiple air jets in real time. We performed a psycho-physical evaluation of different flow velocities and a subjective evaluation of different velocity profiles. We found that FlowHaptics reliably created the illusion of the pressure distribution of flowing water on the fingers where the flow velocity could be distinguished within the range of 8.42% to 13.05%, and our estimated flow velocity profile with the configuration of three air jets felt more similar to flowing water when compared to a constant velocity profile according to the users.

Investigation of the influence of the flow structure on the accuracy of flow measurement before a hydrometric structure in an open channel

2020 ◽  
pp. 41-44
Author(s):  
Anatoly Kusher
Keyword(s):  
Velocity Profile ◽  
Flow Velocity ◽  
Water Flow ◽  
Flow Measurement ◽  
Water Discharge ◽  
Critical Depth ◽  
Flow Measurements ◽  
Study Results ◽  
Flow Velocity Profile ◽  
Upstream Flow

The reliability of water flow measurement in irrigational canals depends on the measurement method and design features of the flow-measuring structure and the upstream flow velocity profile. The flow velocity profile is a function of the channel geometry and wall roughness. The article presents the study results of the influence of the upstream flow velocity profile on the discharge measurement accuracy. For this, the physical and numerical modeling of two structures was carried out: a critical depth flume and a hydrometric overfall in a rectangular channel. According to the data of numerical simulation of the critical depth flume with a uniform and parabolic (1/7) velocity profile in the upstream channel, the values of water discharge differ very little from the experimental values in the laboratory model with a similar geometry (δ < 2 %). In contrast to the critical depth flume, a change in the velocity profile only due to an increase in the height of the bottom roughness by 3 mm causes a decrease of the overfall discharge coefficient by 4…5 %. According to the results of the numerical and physical modeling, it was found that an increase of backwater by hydrometric structure reduces the influence of the upstream flow velocity profile and increases the reliability of water flow measurements.

scholarly journals Analysis and Evaluation of the Spatial Structure of Cittaslow Towns on the Example of Selected Regions in Central Italy and North-Eastern Poland

Land ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 780
Author(s):  
Marek Zagroba ◽  
Katarzyna Pawlewicz ◽  
Adam Senetra
Keyword(s):  
Sustainable Development ◽  
Spatial Structure ◽  
Dimensional Space ◽  
Subjective Evaluation ◽  
Central Italy ◽  
Small Towns ◽  
Natural Environments ◽  
Architectural Features ◽  
Italian Regions ◽  
Local Traditions

Cittaslow International promotes harmonious development of small towns based on sustainable relationships between economic growth, protection of local traditions, cultural heritage and the environment, and an improvement in the quality of local life. The aim of this study was to analyze and evaluate the differences and similarities in the spatial structure of Cittaslow towns in the Italian regions of Tuscany and Umbria and the Polish region of Warmia and Mazury. The study examined historical towns which are situated in different parts of Europe and have evolved in different cultural and natural environments. The presented research attempts to determine whether the spatial structure of historical towns established in different European regions promotes the dissemination of the Cittaslow philosophy and the adoption of sustainable development principles. The urban design, architectural features and the composition of urban and architectural factors which are largely responsible for perceptions of multi-dimensional space were evaluated. These goals were achieved with the use of a self-designed research method which supported a subjective evaluation of spatial structure defined by historical urban planning and architectural solutions. The study demonstrated that Medieval urban layouts can be successfully incorporated into the modern urban fabric to promote sustainable development and slow living.

Measurement and Numerical Simulation of the Velocity Profile in the Thin Film of an Impinging Water Jet

2021 ◽  
Vol 144 (3) ◽  
Author(s):  
Matthias Joppa ◽  
Mike Bermuske ◽  
Frank Rüdiger ◽  
Lars Büttner ◽  
Jochen Fröhlich ◽  
...  
Keyword(s):  
Velocity Profile ◽  
Simulation Model ◽  
Process Optimization ◽  
Low Cost ◽  
Simulation Models ◽  
Fluid Simulation ◽  
Doppler Velocity ◽  
Measurement Technology ◽  
Mean Velocity ◽  
Validation Data

Abstract Impinging circular free-surface water jets are used in challenging cooling and cleaning tasks. In order to develop simulation models for process optimization, validation data are required, which are currently not available. Therefore, the flow field of these jets is studied for the first time with the novel laser Doppler velocity profile sensor. The mean velocity field and fluctuations are measured within the stagnation and adjacent redirection region for radial coordinates up to three times the nozzle diameter. In the examined parameter range with jet velocities up to 17 m/s and nozzle diameters up to 5.2 mm, i.e., Reynolds numbers up to 69 500, thin films of a few hundred micrometers are formed, which hinder the measurement with common optical measuring systems. Based on the measurement results, a comparatively low-cost volume of fluid simulation model is developed and validated that presumes a relaminarized film flow. The profiles measured and the simulated flow show very good agreement. In the future, the simulation model provides a basis for process optimization and the innovative measurement technology used will prospectively provide further detailed insights into other flows with high velocity gradients.

scholarly journals Flow Velocity Profile of Micro Counter-Current Flows

2007 ◽  
Vol 23 (2) ◽  
pp. 131-133 ◽  
Author(s):  
Arata AOTA ◽  
Akihide HIBARA ◽  
Kyosuke SHINOHARA ◽  
Yasuhiko SUGII ◽  
Koji OKAMOTO ◽  
...  
Keyword(s):  
Velocity Profile ◽  
Flow Velocity ◽  
Flow Velocity Profile ◽  
Current Flows ◽  
Counter Current
Sign in / Sign up

Export Citation Format

Share Document