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Inanimate Debris Generated by Adverse Weather Conditions
Published in Ahmed F. El-Sayed, Foreign Object Debris and Damage in Aviation, 2022
GA and turboprop powered aircraft use inflatable boots attached with glue to the leading edges of the wings and stabilizers to break off ice formed on them (Figure 4.19). During operation, pressurized air is forced into the bladder causing it to expand with a surface deflection rate of approximately 0.35 in/sec [189]. This expansion breaks the bond between ice and bladders and fractures accreted ice into small pieces. Most boots are inflated for 6 to 8 sec. They are deflated by vacuum suction. The vacuum is continuously applied to hold the boots tightly against the aircraft while not in use. Boots used in GA aircraft typically inflate and deflate along the length of the wing, while for larger turboprop aircraft, the boots are installed only in selected sections along the wing.
Sinter Productivity: Theoretical Consideration and Plant Practice
Published in Ram Pravesh Bhagat, Agglomeration of Iron Ores, 2019
The rate of sintering can be accelerated by increasing the rate of air filtration across the sinter bed. This can be increased by: Increasing the suction pressure. To increase the suction pressure, which is a design (and machine) parameter, has restrictions. An increase in suction pressure gives more opportunities for leakage through the pallet sides in an existing operating sintering plant.Decreasing the gas dynamic resistance of the sinter charge; that is, increasing the bed permeability during the sintering. The resistance of sinter mix to gas dynamics on sintering is fairly related to the material characteristics and process parameters, including the granulation of sinter blends. These aspects have ben detailed in Sec. 6.3 and Sec. 6.5.
Flow of Solid-Gas Mixture in Pipe (Pneumotransport)
Published in Henry Liu, Pipeline Engineering, 2017
The negative-pressure systems, also called suction systems, behave like a vacuum cleaner. The prime mover (an air pump) of the system is placed near the exit of the pipe. A vacuum (suction) is created in the pipe by the prime mover to suck or move the solid-air mixture through the pipe. Because the maximum pressure differential across a pipe that can be developed by a suction system is always less than one atmospheric pressure, the suction system can only be used for relatively short distances, normally not more than a few hundred feet. For a suction system of a given negative pressure Δp to transport a given type of solid, longer transport distance can be achieved if the pipe diameter is larger. One cannot use a lower velocity to achieve a longer transport distance because it may cause the solids to settle from the flow and block the pipe.
Multiple slips and double stratification in MHD flow of hybrid nanofluid past a permeable sheet: triple solutions and stability analysis
Published in Waves in Random and Complex Media, 2023
Rusya Iryanti Yahaya, Norihan Md Arifin, Najiyah Safwa Khashi'ie, Fadzilah Md Ali, Siti Suzilliana Putri Mohamed Isa
In certain engineering processes, suction is utilized as a method to improve the fluid flow near the region of a surface. The velocity profile, , with various values of S are depicted in Figure 2(a). In this figure, the enhancement of the suction parameter improves the velocity profile, which reduces the momentum boundary layer thickness. As a result, the velocity gradient at the surface, , increases and boosts the value of , as found in Table 5.