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Journal articles on the topic 'Air ducts Air ducts'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Dobrostan, O., S. Novak, and V. Drizhd. "FIRE RESISTANCE OF STEEL AIR DUCTS WITH COMBINED FIRE PROTECTION SYSTEM." Scientific bulletin: Сivil protection and fire safety 1, no. 1 (2020): 52–65. http://dx.doi.org/10.33269/nvcz.2020.1.52-65.

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The results of research of fire resistance of steel air ducts with the combined system of fire protection in the conditions of fire influence according to the standard temperature regime according to DSTU B V.1.1-4 are resulted. Steel air ducts were investigated, in the design of which two fire protection systems were used, in which passive fire protection material material (fiberglass "IPS-T-1000") and reactive fire protection material materials ("Endotherm HT-150" and "Endotherm 250103") were used. The research method is applied, which is based on the provisions of DSTU B V.1.1-16. The essen

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2

Trninić, Marta, Boško Rašuo, and Mirko Dinulović. "Air duct modification towards outlet pressure drop and vibration level reduction." Tehnika 75, no. 4 (2020): 457–66. http://dx.doi.org/10.5937/tehnika2004457t.

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In this work complete methodology for calculation and analysis of fluid flow in air ducts is presented. In order to minimize outlet pressure drop and to reduce the duct vibrations the plates with airfoil cross sections are added to duct critical zones. It was observed that airfoil stream plates efficiently contribute to outlet pressure drop, duct vibration and noise reduction. Modern methods such as CFD and FEA can be efficiently deployed in numerical treatise of flow and vibration analysis in air ducts.

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3

Li, Lian, and Zhi Yang Yan. "Central Air-Conditioning Duct Cleaning System Based on SRV1." Applied Mechanics and Materials 130-134 (October 2011): 3916–19. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.3916.

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This paper puts forwards the idea of using SRV1 as the platform and making a whole and integrated central air-conditioning duct cleaning system by combining lighting and cleaning devices with dust cleaning devices which all together could fulfill the task of cleaning the central air-conditioning ducts. With good mobility and extended function and also small in size,SRV1, which can also realize wireless remote control and trunking communication, is available for monitoring and cleaning all parts of the ducts simultaneously and can be applied in the complicated environment of the central air-con

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4

Yan, Shu Xia, Xi Ping Wu, and Dong Wang. "CFD Analysis of Performance of a Reconstruction Plan of Smoke Control System in Metro Station." Advanced Materials Research 243-249 (May 2011): 801–5. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.801.

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There are plenty of pipes to be arranged in subway station platform. Optimizing the air-conditioning system ducts is especially important because of its large size. Due to the location of stairs and the size of ducts, the platform exhaust ducts of a Shanghai subway station were laid out within the range from the stair to the end of the platform which probably can’t exhaust smoke effectively in fire. In reconstruction plan, air supply ducts and discharge ducts are connected and valves are added. Air supply pipe can be changed into discharge duct by controlling the valves. The smoke extraction p

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5

Yigit, Cemil. "Effect of Air-Ducted Blade Design on Horizontal Axis Wind Turbine Performance." Energies 13, no. 14 (2020): 3618. http://dx.doi.org/10.3390/en13143618.

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Wind turbines without pitch control are more preferable from economical point of view but aerodynamic stall affects them more and after a critical wind speed local boundary layer separation occurs. Consequently, their power production is relatively low. In this study, air ducts added on the blade and using the airflow from them the kinetic energy of the low-momentum fluid behind the surface was increased and delay of separation of the boundary layer from the surface was examined The Response Surface Optimization method was utilized in order to get the best possible design under the constraints

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6

Gaczoł, Tomasz. "Natural balanced ventilation. Simulations part 2." E3S Web of Conferences 49 (2018): 00026. http://dx.doi.org/10.1051/e3sconf/20184900026.

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The paper is devoted to test results of air flow through natural ventilation supply-exhaust ducts in the rooms located on the upper floor of the building that were conducted in ANSYS Fluent software. Three types of solutions were selected for the tests: air inflow into the room through the air intake located at the basement level, air inflow through the window ventilator (although no longer used, this solution can be found in many existing residential buildings) and the natural ventilation system supported with the so-called “solar chimney” that is usually a glass superstructure, located on th

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7

Jamadar, Soyab A. "A Review on Various Methodologies for AC Duct Cleaning." Journal of Advanced Research in Applied Mechanics and Computational Fluid Dynamics 07, no. 3&4 (2020): 1–5. http://dx.doi.org/10.24321/2349.7661.202003.

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Cleaning of the AC ducts is the need because it creates problems such as the bad indoor air quality which results in health issues and it also causes the large maintenance of the system. The uncleaned air ducts become home for fungi, dust and harmful microbial. The causes and effects of this thing are mentioned following. The AC ducts can be cleaned through various methodologies i.e. conventional and by using robots. In the conventional system, there is manual cleaning by using some equipment. Cleaning the ducts by using robots would be a good solution for this. Different types of robot system

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8

Gaczoł, Tomasz. "Living quarters. A natural balanced ventilation system. Simulations part 1." E3S Web of Conferences 49 (2018): 00025. http://dx.doi.org/10.1051/e3sconf/20184900025.

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In the following article the author proposes the solution for a properly functioning natural ventilation system based on the use of supply and exhaust ducts, i.e. by designing a natural balanced ventilation system. The paper is devoted to test results of air flow through natural ventilation supply-exhaust ducts in the rooms located on the lower floor of the building. The simulations conducted in ANSYS Fluent software relate to such issues as: pressure system inside the room and in the exhaust duct, distribution of air temperatures in the room, vector direction of airflow through supplyexhaust

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9

Agafonova, Vera. "Geometric characteristics of micro holes in a fabric air duct." E3S Web of Conferences 164 (2020): 01034. http://dx.doi.org/10.1051/e3sconf/202016401034.

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The purpose of this study is to develop new effective air supply devices, taking into account the current level of development of science and technology and the emergence of modern high-tech materials. These include microperforated fabric ducts made of a polymer composite material. The holes in such ducts are cut with a laser. The results of studying the geometric characteristics of micro holes in a textile air duct section using an optical microscope are presented. It was found that the area of the holes varies in the range from 39629 μm2 to 50955 μm2. The average value of the area of micro h

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10

Kakoty, Sashindra K., and Vinay K. Roy. "Bulk Reaction Modeling of Sound Propagation Through Circular Dissipative Ducts Backed by an Air Gap." Journal of Vibration and Acoustics 128, no. 6 (2006): 699–704. http://dx.doi.org/10.1115/1.2345669.

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Circular and annular dissipative ducts are extensively used for attenuation of sound in industrial applications. In most of the cases the characteristics of lining material is considered to be locally reacting, although; it may not be true always. This is because there are not many investigations available for bulk reaction modeling of circular and annular ducts. The present paper deals with a generalized formulation of a sound wave with mean and induced flow for bulk reaction approach, which can analyze sound attenuation and phase speed in circular and annular cross-section ducts. In the abse

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11

Sahu, Kamlesh, and Gyaneshwar Sanodiya. "Enhanced Solar Air Heaters for Crop Drying." Indian Journal of Agriculture Engineering 1, no. 2 (2021): 1–5. http://dx.doi.org/10.35940/ijae.b1506.111221.

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Solar air heaters are placed on farms to provide heat for the drying of grain and crop harvesting and harvesting. The results of the thermal study showed that solar air heaters are capable of providing a sufficient increase in air temperature under the majority of crop drying circumstances studied. The restricted thermal capacity of air, as well as the low heat transfer coefficient between the absorber plate and the air flow via the ducting system, both contribute to the overall thermal efficiency of solar air heaters. Solar air heaters must be more efficient in order to be more affordable. Th

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12

Walker, A. Duncan, Gavita S. Regunath, Jon F. Carrotte, and Paul A. Denman. "Intercooled Aero-Gas-Turbine Duct Aerodynamics: Core Air Delivery Ducts." Journal of Propulsion and Power 28, no. 6 (2012): 1188–200. http://dx.doi.org/10.2514/1.b34450.

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13

Mentes, ŞSibel, and Zerefsan Kaymaz. "Investigation of Surface Duct Conditions over Istanbul, Turkey." Journal of Applied Meteorology and Climatology 46, no. 3 (2007): 318–37. http://dx.doi.org/10.1175/jam2452.1.

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Abstract A comprehensive examination of 2 yr of radiosonde data to determine the surface duct conditions over Istanbul (4°N, 29°E), Turkey, was made. The refractivity of the atmosphere is a function of air temperature and water vapor pressure. Any negative gradient in the modified refractivity results in the presence of a duct in the atmosphere. Therefore, the occurrence of ducts strongly depends upon both the synoptic and the local meteorological conditions that prevail over the region. The characteristics of surface ducts occurring over Istanbul were examined statistically. It was found that

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14

Khoroshko, V. V., R. V. Hlinisty, R. R. Hlinisty, E. N. Shneiderov, A. G. Korolev та O. M. Korol. "Еlectronic fire safety systems efficiency in the combustion zone of cars for underground parkings of residential buildings". Doklady BGUIR 18, № 7 (2020): 63–70. http://dx.doi.org/10.35596/1729-7648-2020-18-7-63-70.

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In this paper we presents the results of tests of automatic fire alarm systems in terms of reducing the temperature effect on building structures (floors), air ducts of the exhaust smoke ventilation system. Tests were carried out to determine the efficiency of the antismoke ventilation system for the removal of combustion products through steel air ducts with a metal thickness of 1 mm, as well as analysis of the temperature regime on building structures, the air duct of the exhaust smoke ventilation system under fire exposure. For the warning system (SO) of the second type, CO-2 we used on the

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15

Pazderka, Jiří, Eva Hájková, and Martin Jiránek. "UNDERGROUND AIR DUCT TO CONTROL RISING MOISTURE IN HISTORIC BUILDINGS: IMPROVED DESIGN AND ITS DRYING EFFICIENCY." Acta Polytechnica 57, no. 5 (2017): 331. http://dx.doi.org/10.14311/ap.2017.57.0331.

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The underground air ducts along peripheral walls of a building are a remediation method, which principle is to enable an air flow along the moist building structure’s surface to allow a sufficient evaporation of moisture from the structure. This measure reduces the water transport (rising moisture) into the higher parts of the wall where the high water content in masonry is undesirable. Presently, underground air ducts are designed as masonry structures, which durability in contact with ground moisture is limited. The article describes a new design of an underground air duct, which is based on

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16

Gherghe, Ion, Doru Cioclea, Florin Rădoi, Adrian Matei, and Răzvan Drăgoescu. "Notions regarding the design of suction systems for industrial ventilation." MATEC Web of Conferences 342 (2021): 02006. http://dx.doi.org/10.1051/matecconf/202134202006.

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Air flow in ducts is one of the basic processes of ventilation and air conditioning. Knowledge of this phenomenon and the laws according to it is indispensable for drawing up the sizing calculations of the duct networks, for determining the energy needed to move the air as well as for determining the aerodynamic parameters related to the ventilation ducts. Industrial buildings include large spaces with various sources of releases of harmful substances. Type of these sources and their location depends on the technological process in each section or room.The main role of industrial ventilation s

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17

Gaj, Patryk, and Joanna Kopania. "Influence of Geometry of Channel on the Flow Noise Parameters." Mechanics and Mechanical Engineering 22, no. 2 (2020): 541–52. http://dx.doi.org/10.2478/mme-2018-0043.

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AbstractAcoustic emission through duct walls is an important problem in engineering acoustics. This phenomenon most commonly occurs in heating, ventilating and air-conditioning (HVAC) and other gas flow ducting (large industrial silencers). Many works focus on elaboration of more exact description of the acoustic field phenomena reflecting the real conditions in which these appliances operate. As a standard, circle or rectangular ducts are used in ventilation systems. However, technical conditions during the installation of the HVAC system, due to the limitation of the assembly space, require

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18

Mahfud, Chairun Nisa’, and Adi Winarto. "Anatomi Organ Reproduksi Jantan Biawak Air Asia, Varanus salvator (Reptil: Varanidae)." Acta VETERINARIA Indonesiana 3, no. 1 (2016): 1–7. http://dx.doi.org/10.29244/avi.3.1.1-7.

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Indonesia merupakan negara dengan tingkat eksploitasi biawak V. salvator terbesar di dunia yang sebagian besar untuk melayani permintaan perdagangan kulit. Tingginya permintaan kulit biawak di Indonesia mengkhawatirkan menyebabkan turunnya populasi satwa tersebut. Penelitian ini bertujuan untuk mempelajari anatomi organ reproduksi jantan biawak air asia (Varanus salvator) (Reptil: Varanidae). Dua ekor biawak jantan dewasa digunakan dalam penelitian ini. Hewan dianestesi, dilakukan exanguinasi, dan difiksasi dengan larutan paraformaldehida 4% secara perfusi. Pengamatan dilakukan terhadap situs

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19

Vogman, L. P., D. A. Korolchenko, and A. V. Khryukin. "Determination of conditions for spontaneous combustion of combustible dust deposits on equipment, in ventilation systems, and aspiration systems of buildings and structures." Pozharovzryvobezopasnost/Fire and Explosion Safety 29, no. 4 (2020): 32–41. http://dx.doi.org/10.22227/pvb.2020.29.04.32-41.

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Introduction. Determination of the scientifi cally substantiated frequency of cleaning the ducts of local exhausts of industrial buildings and structures is one of the tasks in the fi eld of fi re safety of industrial enterprises. The paper describes design methods, in particular, a method for determination of the induction period during spontaneous combustion of dust deposits in air ducts of ventilation systems and equipment, which can be used in solving problems focused on the development of preventive measures to ensure their fi re and explosion safety.Methods. In order to solve the problem

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20

Tsuruta, K., and K. Kojima. "Dynamic Design Procedure for HVAC Ducts." Journal of Pressure Vessel Technology 110, no. 4 (1988): 413–21. http://dx.doi.org/10.1115/1.3265624.

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Design layout of ducts and supports systems which make up the heating, ventilating and air-conditioning systems (HVAC) is based upon the Japanese Industrial standard (JIS)[1] for hanger support systems conforming to SMACNA[2] standards of high-rigidity design, where emphasis is placed on buildings containing duct systems. However, since high-rigidity systems involve raising the rigidity of the total system, the weight and number of support structures have to be increased, thus posing economic problems. On the other hand, hanger systems are problematic due to their structural weakness. Therefor

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21

Ding, Juli, Jianfang Fei, Xiaogang Huang, Xiaoping Cheng, and Xiaohua Hu. "Observational Occurrence of Tropical Cyclone Ducts from GPS Dropsonde Data." Journal of Applied Meteorology and Climatology 52, no. 5 (2013): 1221–36. http://dx.doi.org/10.1175/jamc-d-11-0256.1.

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AbstractOn the basis of global positioning system dropsonde data, Japan Meteorology Agency Regional Spectral Model analysis data, National Centers for Environmental Prediction reanalysis data, satellite products from the Naval Research Laboratory, and best-track tropical-cyclone (TC) datasets from the Shanghai Typhoon Institute, the statistical characteristics of the ducts induced by TCs (TC ducts) over the western North Pacific Ocean were analyzed for the period from September 2003 to September 2006, and two typical strong-duct cases with remarkable differences in formation cause were analyze

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22

Jayadipraja, Erwin Azizi. "ANALYSES OF RADIATION OF ELECTROMAGNETIC WAVES IN THE HIGH-VOLTAGE AIR DUCT (150 kV) CONSTRUCTION ON HEALTH." Public Health of Indonesia 3, no. 4 (2017): 152–59. http://dx.doi.org/10.36685/phi.v3i4.143.

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Background: High-voltage air ducts is the government program to supply electricity needs. However, in practice, obstacles have been identified in the form of rejection from the community due to the outstanding issues that high-voltage air ducts have an impact on health.Aim: This research aims to analysis the magnitude of electromagnetic wave radiation of high-voltage air ducts construction on health.Methods: The study was conducted by measuring electromagnetic wave radiation prior to high-voltage air ducts (150 kV) construction and predicting the amount of radiation generated after this operat

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23

Sijercic, Miroslav, Srdjan Belosevic, and Predrag Stefanovic. "Modeling of pulverized coal combustion stabilization by means of plasma torches." Thermal Science 9, no. 2 (2005): 57–72. http://dx.doi.org/10.2298/tsci0502057s.

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Application of plasma-system for pulverized coal ignition and combustion stabilization in utility boiler furnaces promises to achieve certain savings compared to the use of heavy oil burners. Plasma torches are built in air-coal dust mixture ducts between coal mills and burners. Characteristics of processes in the ducts with plasma-system for pulverized coal combustion stabilization are analyzed in the paper, with respect to the modeling and numerical simulation of mass, momentum and heat transfer in two-phase turbulent gas-particle flow. The simulations have been performed for three different

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24

Chen, Xuejun, Lei Wang, Zhikui Liu, and Yinghong Qin. "A Preliminary Study on the Long-Term Structural Stability of Ventilation Ducts in Cold Regions." Civil Engineering Journal 5, no. 6 (2019): 1227–34. http://dx.doi.org/10.28991/cej-2019-03091327.

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The construction of roadways in permafrost regions modifies ground-surface conditions and consequently, negatively varies thermal stability of the underlying frozen soils. To avoid the thawing of the permafrost layer under the scenario of global warming, roadways are usually laid on a built-up embankment, which not only disperses the traffic loads to underlying layers but also minimize the thermal disturbance. In the embankment, duct ventilation, or called air duct, can be embedded to further cool the underlying permafrost. While the thermal performance of duct ventilations has been well docum

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25

Li, Yong, Weili Li, and Ying Su. "Sensitivity of Axial Velocity at the Air Gap Entrance to Flow Rate Distribution at Stator Radial Ventilation Ducts of Air-Cooled Turbo-Generator with Single-Channel Ventilation." Energies 12, no. 18 (2019): 3442. http://dx.doi.org/10.3390/en12183442.

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In the design and calculation of a 330 MW water-water-air cooling turbo-generator, it was found that the flow direction of the fluid in the local stator radial ventilation duct is opposite to the design direction. In order to study what physical quantities are associated with the formation of this unusual fluid flow phenomenon, in this paper, a 100 MW air-cooled turbo-generator with the same ventilation structure as the abovementioned models is selected as the research object. The distribution law and pressure of the fluid in the stator radial ventilation duct and axial flow velocity at the ai

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26

Ali, Mohamed E. "Natural Convection Heat Transfer From Horizontal Rectangular Ducts." Journal of Heat Transfer 129, no. 9 (2006): 1195–202. http://dx.doi.org/10.1115/1.2739623.

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Experimental investigations have been reported on steady state natural convection from the outer surface of horizontal ducts in air. Five ducts have been used with aspect ratios (Γ=duct height/duct width) of 2, 1, and 0.5. The ducts are heated using internal constant heat flux heating elements. The temperatures along the surface and peripheral directions of the duct wall are measured. Longitudinal (circumference averaged) heat transfer coefficients along the side of each duct are obtained for laminar and transition regimes of natural convection heat transfer. Total overall averaged heat transf

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27

Srinivasan, K. "Measurement of air leakage in air-handling units and air conditioning ducts." Energy and Buildings 37, no. 3 (2005): 273–77. http://dx.doi.org/10.1016/j.enbuild.2004.06.014.

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28

Sousa, Leandro Fontes de, Magaly De Fatima Correia, Maria Regina da Silva Aragão, and Roberta Everllyn Pereira Ribeiro. "DUTOS TROPOSFÉRICOS E A ESTRUTURA DA CAMADA LIMITE PLANETÁRIA NA REGIÃO DE PETROLINA." Ciência e Natura 38 (July 20, 2016): 318. http://dx.doi.org/10.5902/2179460x20243.

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The planetary boundary layer (PBL) structure is investigated focusing on days with low-tropospheric ducts occurrence in the Petrolina-PE region, in the period from 1 to 29 April 2014. Ducts identification and the estimative of the PBL top/height and its dynamic and thermodynamic characterization is based on 12 UTC upper-air soundings launched at the altitude station of Petrolina. Surface ducts are associated with high instability and wind speed intensification in the surface layer. Ducts at the PBL top (elevated ducts) are associated with a decrease in the moisture content of the air and a win

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29

Li, Caoyang, and David Herrin. "The effect of aspect ratio on the inerstion loss of lined ducts." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (2021): 4889–95. http://dx.doi.org/10.3397/in-2021-2871.

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The American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) Handbook provides tabulated information that can be used to determine the insertion loss of a variety of lined and unlined ducts. However, the tabulated cross-sections are primarily for square ducts. Not surprisingly, there is a need for information on the insertion loss of ducts having different aspect ratio cross-sections. Hence, the insertion loss for large aspect ratio cross-sections are investigated using a previously validated finite element simulation approach. A coupled structural-acoustic finite el

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30

Satdinov, R. A., E. A. Veshkin, V. I. Postnov та S. V. Strelnikov. "РСМ low-pressure air ducts in aircraft". Proceedings of VIAM, № 8 (2016): 8. http://dx.doi.org/10.18577/2307-6046-2016-0-8-8-8.

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31

S. F. Barrington and I. R. MacKinnon. "AIR DISTRIBUTION FROM RECTANGULAR WOODEN VENTILATION DUCTS." Transactions of the ASAE 33, no. 3 (1990): 0944–48. http://dx.doi.org/10.13031/2013.31421.

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32

Wallin, Olle, and Tor-Goran Malmstrom. "Particle Deposition Models for Ventilation Air Ducts." HVAC&R Research 1, no. 3 (1995): 194–217. http://dx.doi.org/10.1080/10789669.1995.10391319.

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33

Huo, Fei Yang, Jia Hui Sun, Wei Li Li, and Yi Huang Zhang. "Influence of Large Turbo-Generator Stator Ventilation Ducts Structural Changes on Stator Temperature." Advanced Materials Research 462 (February 2012): 318–26. http://dx.doi.org/10.4028/www.scientific.net/amr.462.318.

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For the complex status of fluid flow in stator radial ventilation ducts of large turbo-generator, the temperature distribution of stator is dramatically affected by the flow status of cooling medium in stator ventilating ducts. In this paper, a new ventilating ducts structure in stator is investigated. According to fixing a wind deflector on the stator teeth adjacent to the ventilation ducts, the fluid flow status of cooling air is changed flowing in stator ventilation ducts. For this reason, the effect of heat transfer in stator is changed. Taking an air-cooled turbo-generator as an example,

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34

Putra, Dian Eka, and Fitra Angga. "STUDI SISTEM PENTANAHAN SALURAN UDARA TEGANGAN TINGGI(SUTT) PENGHANTAR 150 KV LUBUK LINGGAU - PEKALONGAN PT. PLN (PERSERO) UNIT PEMBANGKIT DAN TRAMSISI (UPT) BENGKULU." JURNAL SURYA ENERGY 3, no. 1 (2018): 220. http://dx.doi.org/10.32502/jse.v3i1.1253.

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High-voltage 150 kV air ducts that use open wire are very likely to cause interference, both external and internal interference. And one of the most common disorders is due to lightning strikes. To optimize the distribution of electrical energy in the high voltage air duct, an earth system is installed at the foot of the tower. This study was conducted to calculate the value of foot tower resistance installed on 150 kV high voltage air line Lubuk Linggau - Pekalongan. Here it will also be discussed to minimize the resistance in earth that exceeds the set standard. Based on measurements using e

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35

Yang, Peng Fei, Wei Sun, Sheng Nan Liu, and Ming Hua Ouyang. "Single Image Haze Removal Based on Dark Channel Prior Applied on Air Duct Robot." Applied Mechanics and Materials 220-223 (November 2012): 1307–10. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.1307.

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The rule of dark channel prior has made significant effect in outdoor image dehazing. The camera on air duct cleaning robots will capture foggy pictures when they are working because of raised dust, these foggy pictures have serious impact on the robot cleaning work. According to the characteristics of pictures in air ducts, we remove haze of these images based on dark channel prior, experimental results show that this method has good effect.

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36

D'Orazio, M., C. Di Perna, and F. Stazi. "Thermal behaviour of vented roofs." Structural Survey 27, no. 5 (2009): 411–22. http://dx.doi.org/10.1108/02630800911002657.

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PurposeThe purpose of this paper is to present the results of an experimental study aimed at analysing the effect of the roof tile air permeability on the thermal performances of ventilation ducts in the roof. The main reason underlying this study is the fact that the theoretical reference assumed for the manufacture and sizing of ventilation ducts (the accepted theory on roof ventilation) is clearly limited when applied to ducts which are not perfectly airtight (Hens) and results in an oversizing of the ventilation ducts.Design/methodology/approachA section of roof is built, covered with diff

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37

Kadambi, V., E. K. Levy, and S. Neti. "Heat Transfer and Pressure Drop in a Helically Coiled Rectangular Duct." Journal of Heat Transfer 108, no. 2 (1986): 343–49. http://dx.doi.org/10.1115/1.3246927.

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The present paper deals with experiments using air in three helically coiled rectangular ducts of mean diameters 12.7 cm, 17.8 cm, and 22.8 cm, respectively, made of rectangular wave-guide tubing of dimensions 1.27 cm × 0.64 cm. Pressure variations observed around the ducts were qualitatively in agreement with the expectations for secondary flow. The friction factors change gradually with increasing Reynolds numbers over the range 1200–10,000 without exhibiting a sudden transition from laminar flow to turbulence. At all Reynolds numbers, these are higher than those for a straight duct by 20–10

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38

Kołodziej, Szymon. "The effect of the leakage of the engine arrest engine and emissions of harmful substances." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 6 (2018): 502–5. http://dx.doi.org/10.24136/atest.2018.121.

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In this article, the issues related to vehicular traffic in big cities and heightened harmful substance emissions stemming from it were described. In the research part, the effect of air leakage in the SI engine intake manifold on substance emissions was investigated. The manifold was customized to simulate air leakage in each of its air ducts. Same ratio of leakage was assumed for each duct, and substance emissions were measured in full range of engine rotational speeds. A difference in exhaust gas composition was shown for each researched variant, being the result of varying cylinder filling

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Dang, Phuong Thao, Zinovii Malanchuk, and Vitalii Zaiets. "Investigation of resistance and air leakage of auxiliary ventilation ducting in underground mine in Quang ninh." E3S Web of Conferences 280 (2021): 08002. http://dx.doi.org/10.1051/e3sconf/202128008002.

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Ventilation when driving roadways is one of the most important considerations in coal underground mines. Ventilation efficiency depends on fan performance and ventilation ducting system. In recent years in Vietnam, ducts have often been produced domestically. However, parameters of the duct as duct leakage, duct resistance for designing auxiliary ventilation system are referenced from abroad handbook. This lead to inaccurate design results and needs to adjust efficiency of auxiliary ventilation during driving roadways. Determination of duct resistance; air leakage in ducting system have been u

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Lu, Yi Ping, Qing Hui Pan, Hui Lan Li, and Jia De Han. "Experimental Study of Flow Field of Large Air-Cooled Turbine Generator for Multi-Ventilation Ducts of Stator." Applied Mechanics and Materials 644-650 (September 2014): 377–80. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.377.

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To study rotational air flow field of rotor and complicated flow distinction owing to multi-ventilation ducts of stator in a large air-cooled turbine generator, considering axial symmetry of air supply, an experiment setup of ventilation system of semi-machine configuration was built in this paper. At condition of rotating, ventilation is measured by hot-wire anemometer. Firstly, ventilation in 16 different semi-circle radius is got. Measurement shows that ventilation in different radius varies much. Then ventilation of outlet of stator ducts is measured. The result shows that ventilation whic

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Xing, Xia Qiong, Xin Fei Zhao, Zhang Qin, and Xiao Hong Zhou. "Numerical Simulation the Airflow Field in the Flame Retardant Cloth Ducts." Advanced Materials Research 796 (September 2013): 643–48. http://dx.doi.org/10.4028/www.scientific.net/amr.796.643.

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Fiber air dispersion system (FADS) is a new flexible ventilation terminal in ventilated areas. It can be used in both air transmission and air diffusion. The cloth duct made of flame retardant polyester is critical. The conditioned air can be dispersed to environment by not only micro pores in the fabric but also slot and orifice on the fabric. The micro-pores in the fabric exist in the yarns and fibers. The laser can be used to cut the slot and orifice on the fabric. They can be designed based on the application. In this paper, air dispersion models and basic characteristics of fiber air disp

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Hickling, Tom, and Grant Ingram. "Reynolds-averaged Navier–Stokes modelling in transonic S-ducts with passive flow control." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 1 (2019): 31–45. http://dx.doi.org/10.1177/0957650919845765.

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S-duct diffusers are used in aircraft with embedded engines to route ambient air to the fan face. Sizing and stealth considerations drive a need for high curvature ducts, but the curvature causes complex secondary flows that lead to total pressure distortion and swirl velocities at the engine face. These must be controlled for stable engine operation. In this paper, tubercles, a novel bio-inspired passive flow control method, are analysed numerically in a duct with transonic flow. The results are compared to experimental data obtained as part of a campaign at the Royal Military College, Canada

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Liu, Li, Yi Ping Lu, Jia De Han, and Xue Mei Sun. "Numerical Simulation on Air Volume Flow Rate Distribution of Stator Ducts for Salient Pole Synchronous Motor." Applied Mechanics and Materials 644-650 (September 2014): 373–76. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.373.

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Air volume flow rate distribution of stator ducts along axial and circumferential for salient pole synchronous motor is strongly influenced by the air flow field in the air gap and rotor poles, which is completely different from the flow characteristics of non-salient pole motor and it directly relates to the peak temperature of stator bars and core and axial temperature difference which can affect the safety of the operation. A three-dimensional physical model of 1/8 motor was established and corresponding solution domain boundary conditions were given in this article. The air volume flow rat

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Kvasha, Yu A. "Calculation of a 3D turbulent flow in aircraft gas turbine engine ducts." Technical mechanics 2020, no. 4 (2020): 65–71. http://dx.doi.org/10.15407/itm2020.04.065.

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This work is devoted to the development of approaches to the numerical simulation of 3D turbulent gas flows in different ducts of aircraft gas turbine engines, in particular in inlet device ducts. Inlet devices must provide large values of the total pressure recovery factor and flow uniformity at the engine compressor inlet. The aim of this work is the verification of the operability of a technique developed earlier for the calculation of the parameters of a 3D turbulent flow in complex-shape ducts. The basic approach is a numerical simulation of 3D turbulent gas flows on the basis of the comp

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Madrid Gaviria, Stephania, and José Julián Echeverri Zuluaga. "Association Between Conformation Traits and Reproductive Traits in Holstein Cows in the Department of Antioquia - Colombia." Revista Facultad Nacional de Agronomía Medellín 67, no. 2 (2014): 7311–19. http://dx.doi.org/10.15446/rfnam.v67n2.44174.

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The objective of this study was to adapt and validate a computer model using the Computational Fluid Dinamics (CFD), in the prediction of temperature and air speed in a duct distribution system coupled to a heating furnace that is used in typical poultry houses in tropical and subtropical countries. The validation of the model with experimental data was satisfactory, presenting normalized mean square error NMSE values of 0.25 and 0.02 for air temperature and air speed, respectively. The results evidenced that the proposed model is adequate for predicting the air speed and temperature for this

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Alves Damasceno, Flávio, Jairo Alexander Osorio Saraz, Luciano Barreto Mendes, Samuel Martin, and Marcio Aredes Martins. "Evaluation of a Heating System in Poultry Houses Using a CFD Model." Revista Facultad Nacional de Agronomía Medellín 67, no. 2 (2014): 7355–63. http://dx.doi.org/10.15446/rfnam.v67n2.44178.

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The objective of this study was to adapt and validate a computer model using the Computational Fluid Dinamics (CFD), in the prediction of temperature and air speed in a duct distribution system coupled to a heating furnace that is used in typical poultry houses in tropical and subtropical countries. The validation of the model with experimental data was satisfactory, presenting normalized mean square error NMSE values of 0.25 and 0.02 for air temperature and air speed, respectively. The results evidenced that the proposed model is adequate for predicting the air speed and temperature for this

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Bulgakov, Alexey, and Daher Sayfeddine. "Air Conditioning Ducts Inspection and Cleaning Using Telerobotics." Procedia Engineering 164 (2016): 121–26. http://dx.doi.org/10.1016/j.proeng.2016.11.600.

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De Zilwa, S. R. N., I. Emiris, J. H. Uhm, and J. H. Whitelaw. "Combustion of premixed methane and air in ducts." Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 457, no. 2012 (2001): 1915–49. http://dx.doi.org/10.1098/rspa.2000.0776.

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SUGAWARA, Fumiko, and Nobuhisa MOROOKA. "MICROBIAL CONTAMiNATION IN DUCTS OF AIR CONDITIONING SYSTEMS." Journal of Architecture and Planning (Transactions of AIJ) 62, no. 493 (1997): 55–60. http://dx.doi.org/10.3130/aija.62.55.

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Waller, Al, and Michelle Brown. "Lessons learned from fire in air supply ducts." Process Safety Progress 33, no. 4 (2014): 392–94. http://dx.doi.org/10.1002/prs.11661.

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