scholarly journals Drag Reduction Using Additives in Smooth Circular Pipes Based on Experimental Approach

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1596
Author(s):  
Allessandro Utomo ◽  
Achmad Riadi ◽  
Gunawan ◽  
Yanuar
Keyword(s):  
Drag Reduction ◽  
Experimental Approach ◽  
Reduction Process ◽  
Reducing Agents ◽  
Flow State ◽  
Fluid Resistance ◽  
Theoretical Approaches ◽  
Circular Pipes ◽  
New Research ◽  
Polymer Surfactant

Reduction of fluid resistance using the rheological characteristics of a polymer-surfactant solvent is research that contains many aspects, such as the theory of the drag reduction process, historical journey, and ongoing current research development. Many studies have been conducted, but it is challenging to know all existing and new research threads. The present investigation was conducted using literature studies regarding drag reducing agents. This research will also discuss the characteristics of flowing fluids and their effects on the velocity profile with friction factor of flowing fluids in smooth circular straight pipe geometries based on experimental, theoretical approaches. It concludes with aspects of research conducted around reducing drag using drag reducing agents, ideas about innovations, structuring overlook in testing, and modification of the fluid flow state.

Data, Methods, and Theoretical Implications

2012 ◽  
Vol 45 (02) ◽  
pp. 232-237 ◽  
Author(s):  
Rebecca J. Hannagan ◽  
Monica C. Schneider ◽  
Jill S. Greenlee
Keyword(s):  
Political Psychology ◽  
National Science Foundation ◽  
Science Research ◽  
The Political ◽  
Use Of Data ◽  
Theoretical Approaches ◽  
Rutgers University ◽  
Recent Scholarship ◽  
National Science ◽  
New Research

Within the subfields of political psychology and the study of gender, the introduction of new data collection efforts, methodologies, and theoretical approaches are transforming our understandings of these two fields and the places at which they intersect. In this article we present an overview of the research that was presented at a National Science Foundation (NSF) (#SES-1014854) funded conference “New Research on Gender in Political Psychology” at Rutgers University in March 2011. This scholarship represents the expanding questions and approaches that enhance our understanding of gender within political psychology. As a result, we suggest that further innovation is needed with regard to theory and methods to understand better how gender shapes the political attitudes and actions of individuals. Our discussion here covers the use of data, interdisciplinary methods, and intersectionality to study gender. We conclude with thoughts about the theoretical implications of this recent scholarship and the future of political science research on gender.

scholarly journals Reinforcement learning for bluff body active flow control in experiments and simulations

2020 ◽  
Vol 117 (42) ◽  
pp. 26091-26098
Author(s):  
Dixia Fan ◽  
Liu Yang ◽  
Zhicheng Wang ◽  
Michael S. Triantafyllou ◽  
George Em Karniadakis
Keyword(s):  
Reinforcement Learning ◽  
Fluid Mechanics ◽  
Drag Reduction ◽  
Flow Control ◽  
Bluff Body ◽  
Control Strategies ◽  
Active Flow Control ◽  
Reduction Process ◽  
Automatic Sequence ◽  
Active Flow

We have demonstrated the effectiveness of reinforcement learning (RL) in bluff body flow control problems both in experiments and simulations by automatically discovering active control strategies for drag reduction in turbulent flow. Specifically, we aimed to maximize the power gain efficiency by properly selecting the rotational speed of two small cylinders, located parallel to and downstream of the main cylinder. By properly defining rewards and designing noise reduction techniques, and after an automatic sequence of tens of towing experiments, the RL agent was shown to discover a control strategy that is comparable to the optimal strategy found through lengthy systematically planned control experiments. Subsequently, these results were verified by simulations that enabled us to gain insight into the physical mechanisms of the drag reduction process. While RL has been used effectively previously in idealized computer flow simulation studies, this study demonstrates its effectiveness in experimental fluid mechanics and verifies it by simulations, potentially paving the way for efficient exploration of additional active flow control strategies in other complex fluid mechanics applications.

Effect of polymer–surfactant interaction on its turbulent drag reduction

2011 ◽  
Vol 391 (1-3) ◽  
pp. 125-129 ◽  
Author(s):  
Jung Tae Kim ◽  
Chul Am Kim ◽  
Ke Zhang ◽  
Chun Hag Jang ◽  
Hyoung Jin Choi
Keyword(s):  
Drag Reduction ◽  
Turbulent Drag Reduction ◽  
Turbulent Drag ◽  
Polymer Surfactant

scholarly journals Enhancing the Drag Reduction Phenomenon within a Rotating Disk Apparatus Using Polymer-Surfactant Additives

2016 ◽  
Vol 6 (12) ◽  
pp. 355 ◽  
Author(s):  
Musaab Rashed ◽  
Mohamad Mohd Salleh ◽  
Hayder Abdulbari ◽  
Mohd Ismail
Keyword(s):  
Drag Reduction ◽  
Rotating Disk ◽  
Polymer Surfactant

scholarly journals The Interplay Between Chamber Musicians During Two Public Performances of the Same Piece: A Novel Methodology Using the Concept of “Flow”

2021 ◽  
Vol 11 ◽  
Author(s):  
Eva Bojner Horwitz ◽  
László Harmat ◽  
Walter Osika ◽  
Töres Theorell
Keyword(s):  
Heart Rate ◽  
String Quartet ◽  
Qualitative Data ◽  
Future Research ◽  
Flow State ◽  
Individual Level ◽  
Physiological Indicators ◽  
State Flow ◽  
Record Heart Rate ◽  
New Research

The purpose of the study is to explore a new research methodology that will improve our understanding of “flow” through indicators of physiological and qualitative state. We examine indicators of “flow” experienced by musicians of a youth string quartet, two women (25, 29) and two men (23, 24). Electrocardiogram (ECG) equipment was used to record heart rate variability (HRV) data throughout the four movements in one and the same quartet performed during two concerts. Individual physiological indicators of flow were supplemented by assessments of group “state flow” (means from standardized questionnaires) and a group interview in which the musicians provided qualitative data. A matrix was constructed for the characterization of different kinds of demands in the written music in each one of the four movements for each one of the musicians. HRV derived from ECG data showed non-significant trends for group state flow across the eight musical episodes. Individual-level analysis showed that compared to the other players the first violin player had the highest mean heart rate and the lowest increase in high frequency (HF) power in HRV during this particular movement, particularly during the second concert. The qualitative data illustrated how an interplay of synchronized social interactions between this player and their colleagues during the musical performance was associated with a feeling of group state flow and served to support the first violinist. The case illustrates that the proposed mixed methodology drawing on physiological and qualitative data, has the potential to provide meaningful information about experiences of a flow state, both at individual and group levels. Applications in future research are possible.

Representation and Interpretation of Sketches in Mechanical Design: Experimental and Theoretical Approaches

2003 ◽  
Author(s):  
Y. Zeng ◽  
A. Pardasani ◽  
H. Antunes ◽  
Z. Li ◽  
J. Dickinson ◽  
...  
Keyword(s):  
Design Process ◽  
Set Theory ◽  
Experimental Approach ◽  
Theoretical Foundation ◽  
Mechanical Design ◽  
Mathematical Structure ◽  
Assembly System ◽  
Automobile Assembly ◽  
Theoretical Approaches

This paper aims to establish a theoretical foundation for representing and interpreting free-hand design sketches throughout the conceptual design process. Both experimental and theoretical approaches are used. In using the experimental approach, one case study from a book and one case study from an automobile assembly system manufacturer are used to illustrate the characteristics of design sketches. These characteristics provide the requirements for models of sketch representation and interpretation. In using the theoretical approach, a mathematical structure of design sketches is established. This mathematical structure can naturally and logically model the evolving sketches generated in the design process, through integrating the strengths of set theory and mereology. Based on the results of these two approaches, a design sketch language is developed to be a formal foundation of sketch representation and interpretation.

scholarly journals Coating of Nanolipid Structures by a Novel Simil-Microfluidic Technique: Experimental and Theoretical Approaches

Coatings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 491 ◽  
Author(s):  
Anna Angela Barba ◽  
Sabrina Bochicchio ◽  
Paolo Bertoncin ◽  
Gaetano Lamberti ◽  
Annalisa Dalmoro
Keyword(s):  
Controlled Release ◽  
Specific Surface ◽  
Theoretical Approach ◽  
Surface Engineering ◽  
Experimental Approach ◽  
Lipid Vesicles ◽  
Theoretical Approaches ◽  
Oppositely Charged ◽  
Interesting Solution ◽  
Microfluidic Technique

Nanolipid vesicular structures are ideal candidates for the controlled release of various ingredients, from vitamins for nutraceutical purposes to chemoterapic drugs. To improve their stability, permeability, and some specific surface properties, such as mucoadhesiveness, these structures can require a process of surface engineering. The interaction of lipid vesicles with oppositely charged polyelectrolytes seems to be an interesting solution, especially when the negatively charged liposomes are complexed with the cationic chitosan. In this work, a novel simil-microfluidic technique was used to produce both chitosan-coated vesicles and a vegan alternative composed of cholesterol-free liposomes coated by Guar Hydroxypropyltrimonium Chloride (Guar-HC). The combination between the experimental approach, based on experimental observations in terms of Z-potential, and size evolutions, and the theoretical approach, based on concepts of saturation, was the methodology applied to define the best polycation concentration to fairly cover (vegan or not) liposomes without aggregation. The smart production of coated nanolipid structures was confirmed by characterizations of morphology, mucoadhesiveness, and stability.

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