2 edition of Investigations of nozzle discharge coefficients in a compliant air bearing system. found in the catalog.
Investigations of nozzle discharge coefficients in a compliant air bearing system.
Written in English
Thesis (M.A.Sc.) -- University of Toronto, 1999.
|The Physical Object|
|Number of Pages||144|
Moss: w = aCp1 T 1 where w = discharge in lb per sec, a = area of orifice in sq. in., C = coefficient of flow, p1 = upstream total pressure in psia, and T1 = upstream temperature in deg. F abs. • Values used in calculating above table were C = , p1 = gage pressure + psi, T1 = F abs. This study investigated the influences of bearing geometry and flow parameters on the discharge coefficient in aerostatic bearings with pocketed orifice restrictors. Finite difference method calculation. In aerostatic bearings, an air film separates the bearing surface from the reaction by:
Investigations for Discharge Coefficient of PTC 6 Flow Nozzle in a Wide Range of Reynolds Number The discharge coefﬁcients of the ﬂow nozzles based on ASME PTC 6 are measured in a wide range of Reynolds number from Re d ¼ 10 4 to Re d 7, and the equa-tions of the discharge coefﬁcients are developed for the laminar, the. meansofflownozzles,lowofairis not perfectly steady,thecapacity between the orifice and theflow nozzle on theend of the line introducesatime lag, sothat, though theFile Size: 9MB.
Identification of Discharge Coefficients of Orifice-Type Restrictors for Aerostatic Bearings and Application Examples Chapter (PDF Available) April with Reads How we measure 'reads'. Discharge Coefficient is the ratio of actual discharge through a nozzle or orifice to the theoretical discharge. Commonly known as coefficient of discharge, it is related to the flow and pressure loss through nozzles and the orifices in the fluid systems or fluid mechanics. It is denoted by “Cd” and is a dimensionless number.
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INVESTIGATIONS OF NOZZLE DISCHARGE COEFFICIENTS IN A COMPLIANT AIR BEARING SYSTEM Mélanie Beauchemin Master of Applied Science Graduate Department of Aerospace Science and Engineering University of Toronto Abstract A novel compliant air bearing is being developed for matenais handling and low speed guided transportation : Melanie Beauchemin.
Investigation of nozzle discharge coefficients in a compilant air bearing system. Illaster's thesis. University of Toronto Institute for Aerospace Studies. Author: Luke Stras. Throat and wall tappings were used. The flow nozzles were calibrated in water and in high-pressure nitrogen at 20 and 60 barg.
The wall-tapping data are in excellent agreement with the discharge-coefficient equation in ISO all the data for Re d >10 6 fit the equation with twice the r.m.s.
deviation equal to %. The data extrapolate well from water to higher Reynolds Author: Michael Reader-Harris. The most efficient nozzle is generally considered to be that for which the discharge coefficient is nearest unity. Forms and dimensions of the nozzles being equal, the greater the discharge coefficient, the less the jet turbulence becomes.
The inefficiency of fire streams is directly attributable to the inital turbulence of the jet and this turbulence has its chief origin in the flow condition inside the by: 8. The equation of the discharge coefficient of the flow nozzle is proposed, which consists of the two terms that can be physically evaluated, the theoretical discharge coefficient and the Author: Michael Reader-Harris.
Through comparisons among experimental results, simulation results and prediction results of empirical equations, it was clear that the discharge coefficients were the same for the nozzles with the same throat diameter and were in good agreement with the results of the empirical equations for 10mm nozzles, while that changed with different diffuser angle for other two sets of by: 4.
ILASS – Europe An experimental investigation of discharge coefficient and cavitation length in the elliptical nozzles 2 bances in jet when the flow is cavitating.
Especially hysteresis appeared at the aspect ratio is about 5. The dis-charge coefficient had a Cited by: 9. NASA TECHNICAL NOTE NASA TN D r_ z t-== Z DISCHARGE COEFFICIENTS FOR Discharge nozzle coefficient Inclined orifice Orifice Thick-plate Unclassified I Security Classif.
A schematic diagram of the basic setup utilized for the investigation is shown in figure 1o Air at psig ( N/cm 2) was supplied through a filter and dryer File Size: 1MB.
the discharge coefficient plays an important role in gas flow measurement by means of critical Venturi nozzles. It is known that the discharge coefficient of the Venturi nozzle 15 deflned as the ratio of the actual flowrate to one-dimensional ideal flowrate.
This coefficient should be characterized for viscous boundary layer and flow fleld File Size: 2MB. In this paper, various rational, semirational, and, empirical approximations for the ASME long-radius, flow-nozzle discharge coefficients are first reviewed.
These approximations are then compared to obtain the most probable representation of ASME flow-nozzle data according to a Cited by: 4. The diagram below indicates the air leakage or air volume passing through orifices ranging size 1/64 - 1/4 inches. For well rounded nozzles multiply the vlues in the diagram with For sharp edged nozzles multiply the values with 1 psig = kPa = bar; 1 inch = mm; 1 scfm = nl/s.
High velocity impinging air jets are commonly used for heating, cooling and drying, etc. because of the high heat and mass transfer coefficients which are developed in the impingement region. In order to provide data for the designers of industrial equipment, a variety of slot nozzles were tested to determine the effect on heat transfer of both nozzle shape and slot by: 7.
Subscript 0 refers to the stagnation condition. The mass flow rate is a maximum for nozzles at chocked condition (M =1). The discharge coefficient differs from unity due to the nonuniformity of flow parameters (such as Mach number) at the nozzle exit and presence of boundary layer (viscous effect).Cited by: 6.
To study the discharge coefficients of aerostatic bearings, a new numerical method which combines the method of “separation of variables” for solution of laminar boundary-layer equations and. 9fficient or shortly to the nozzle coefficient to indicate the nozzle CAPACITY AT A GIVEN PRESSURE VALUE WHEN K KHOWN CTG SH 07 EU for nozzles using part of the flow energy to produce wide nozzles, and straight jet nozzles.
r each nozzles are used in practice when a precise result must to be equal to 1, (P 1 bar), the flow rate of the nozzleFile Size: KB.
system (WMFSS) would use very small amount of water to extinguish a fire. System components include water source, water pump, pipe works, and nozzles. System performance depends on the design of those components.
The nozzle is a key component as the droplets size and velocity distribution at an operating pressure and a flow rate are. the discharge coefﬁcient associated with these ﬁlm hole geome-tries as a function of ﬂow parameters on both sides of the ﬁlm holes.
Discharge coefﬁcients associated with many oriﬁce geome-tries and ﬂow conditions have been under investigation by many. Abstract The discharge coefficient in critical nozzles flowing N 2, Ar, CO 2, and H 2 in the Reynolds Number range (2, to 22,) is studied computationally to assess the capability of Computational Fluid Dynamics (CFD) in assisting experimental calibration.
A parametric study is conducted to investigate the effects of the wall thermal boundary condition and gas species on the calibration Cited by: for determining the discharge coefficient of this venturi. An experimental investigation was conducted to determine the discharge coefficient of such a venturi, and the results are compared with the theoretical values.
This investigation covered a range of Reynolds number from 0. 4 x 10^ to x 10° based on venturi throat Size: 2MB. taps, and flat rail surface used to generate the air bearing (drawing not to scale).
Figure Layout of the nozzles and pressure taps currently instaîled in the lower plate of the apparatus (upper diagram), and a representative depiction of the air supply system, including the noule geometry (lower diagram).Author: Bryan R.
Townsend. Nozzle geometry variations on the discharge coef ﬁ cient 23 signi ﬁ cant in ﬂ uences on the discharge coef ﬁ cient, pro ﬁ le of sonic lines and on the nozzle downstream ﬂ ow features.Variation of air core diameter, coefficient of discharge and spray cone angle with liquid flow rate in the nozzle.
d s =8 mm, d o =2 mm, l s =1 mm, 2 α =41 ∘, l o =4 mm. The formation of a central air core in a simplex nozzle is the consequence of a reduction in pressure near the nozzle axis because of the swirling flow of liquid inside by: In a nozzle or other constriction, the discharge coefficient (also known as coefficient of discharge or efflux coefficient) is the ratio of the actual discharge to the theoretical discharge, i.e., the ratio of the mass flow rate at the discharge end of the nozzle to that of an ideal nozzle which expands an identical working fluid from the same initial conditions to the same exit pressures.