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Effect of trailing-edge modification over aerodynamic characteristics of NACA 0020 airfoil
Livya Ethiraj,Subramania Nadaraja Pillai 한국풍공학회 2021 Wind and Structures, An International Journal (WAS Vol.33 No.6
This study investigates the aerodynamic characteristics of NACA series airfoil by altering the trailing edge in the form of extended and serrated sections. This contemporary advent examined NACA 0020 airfoil experimentally at the angle of attack ranging from 0° to 45° and for the Reynolds number of 2.46 × 105. To figure out the flow behaviour, the standard average pressure distribution over the airfoil surface is estimated with 50 pressure taps. The time series surface pressure is recorded for 700 Hz of sampling frequency. The extended trailing edge of 0.1 c, 0.2 c and 0.3 c are attached to the base airfoil. Further, the triangular serration is introduced with the base length of 2 cm, 4 cm and 6 cm. Each base length with three different amplitudes of 0.1 c, 0.2 c and 0.3 c were designed and equipped with the baseline case at the trailing edge and tested. The aerodynamic force coefficient, as well as pressure coefficient are presented. The obtained data advises that modification in the trailing edge will reflect the aerodynamic characteristics and the flow behaviour over the section of a wing. Resultantly, the extended trailing edge as a thin elongated surface attached to a base airfoil without revising the main airfoil favors good lift increment. The serrated trailing edge acts as a flow control device by altering the flow pattern results to delay the stall phenomenon. Besides it, improves lift co-efficient with less amount of additional drag. This extended and serrated trailing edge approach can support for designing the future smart airfoil.
Intravenous catheter flanges as an external nasal stent: a novel technique
Shibani A. Nerurkar,Subramania Iyer,Arjun Krishnadas,Pramod Subash 대한구강악안면외과학회 2024 대한구강악안면외과학회지 Vol.50 No.2
External nasal splints are commonly used for immobilization following nasal fracture reduction or rhinoplasty procedures. The literature documents the use of various materials like thermoplastic materials, aluminum, Orthoplast, fiberglass, plaster of Paris, and polyvinyl siloxane. These materials are bulky, time-consuming, expensive, and cumbersome to use, and have been associated with complications including contact dermatitis and epidermolysis. Furthermore, they cannot be retained if the situation warrants prolonged stabilization and immobilization. We introduce a new technique using readily available scalp vein catheter flanges as an external nasal stent. The technique is easy to master, inexpensive, and limits edema and ecchymosis, while stabilizing the reconstructed nasal skeleton in position during the healing period.
Balamurugan, C.,Maheswari, A.R.,Lee, D.W.,Subramania, A. Elsevier 2014 Current Applied Physics Vol.14 No.3
Beyond the most investigated mesoporous silica and carbon based materials, metal oxides have attracted considerable interest due to their more diverse electronic functionality, which includes gas sensing activities, semiconductor characteristics and magnetic properties. In this paper, we describe the fabrication, characterization and application of mesoporous FeNbO<SUB>4</SUB> nanopowder for ethanol gas sensing application. FeNbO<SUB>4</SUB> nanopowder was synthesized via the niobium-citrate complex method, without using any surfactant and size selection medium. Thermal stability and structure of the nanopowder was analyzed by thermogravimetric analysis (TG/DTA) and X-ray diffraction analysis (XRD). Structural analysis confirmed the formation of FeNbO<SUB>4</SUB> with monoclinic structure. The particle size, electrical and optical properties were also systemically investigated by means of transmission electron microscopy (TEM), impedance and diffused reflectance spectra. Nitrogen adsorption isotherms of the FeNbO<SUB>4</SUB> were type IV with hysteresis loops of type H<SUB>3</SUB> indicating well-defined pore structure with mesoporous nature. The sensing characteristics of FeNbO<SUB>4</SUB> nanopowder such as sensitivity, operating temperature and response time, were studied in the presence of ethanol (C<SUB>2</SUB>H<SUB>5</SUB>OH). Experimental result confirmed that a higher response to ethanol at relatively lower operating temperature of 200 <SUP>o</SUP>C.
C. Balamurugan,A.R. Maheswari,D.W. Lee,A. Subramania 한국물리학회 2014 Current Applied Physics Vol.14 No.3
Beyond the most investigated mesoporous silica and carbon based materials, metal oxides have attracted considerable interest due to their more diverse electronic functionality, which includes gas sensing activities, semiconductor characteristics and magnetic properties. In this paper, we describe the fabrication, characterization and application of mesoporous FeNbO4 nanopowder for ethanol gas sensing application. FeNbO4 nanopowder was synthesized via the niobiumecitrate complex method, without using any surfactant and size selection medium. Thermal stability and structure of the nanopowder was analyzed by thermogravimetric analysis (TG/DTA) and X-ray diffraction analysis (XRD). Structural analysis confirmed the formation of FeNbO4 with monoclinic structure. The particle size, electrical and optical properties were also systemically investigated by means of transmission electron microscopy (TEM), impedance and diffused reflectance spectra. Nitrogen adsorption isotherms of the FeNbO4 were type IV with hysteresis loops of type H3 indicating well-defined pore structure with mesoporous nature. The sensing characteristics of FeNbO4 nanopowder such as sensitivity, operating temperature and response time, were studied in the presence of ethanol (C2H5OH). Experimental result confirmed that a higher response to ethanol at relatively lower operating temperature of 200 C.
Polyaniline-based nanocomposites for direct methanol fuel cells (DMFCs) - A Recent Review
Suba Lakshmi Madaswamy,Asma A. Alothman,Murefah mana AL-Anazy,Ahmad A. Ifseisi,Khadraa N. Alqahtani,Sendhil Kumar Natarajan,Subramania Angaiah,Dhanusuraman Ragupathy 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
This review delivers a summary of the recent advances in polyaniline based electrocatalyst for directmethanol fuel cell applications. Today’s world is urging for global energy due to the fossil fuel diminutionand ecological contamination which is overthrown by the direct methanol fuel cell. Amongst theconducting polymers, polyaniline has a significant role in the direct methanol fuel cell. Due to the highconductivity, unique redox properties, highflexibility, better solubility, reasonable stability, easesynthesis, and low cost. The nanocomposite of polyaniline with other electrochemically active materialssuch as metallic compounds and carbonaceous materials as well as nitrogen-doped carbon materialsderived from PANI based nanocomposite were in detailly discussed in this review.