Closure to “Discussion of ‘An Investigation of Ingress for an “Air-Cooled” Shrouded Rotating Disk System With Radial-Clearance Seals’” (1983, ASME J. Eng. Power, 105, pp. 182–183)

1983 ◽  
Vol 105 (1) ◽  
pp. 183-183
Author(s):  
U. P. Phadke ◽  
J. M. Owen
Keyword(s):  
Rotating Disk ◽  
Radial Clearance ◽  
Disk System

An Investigation of Ingress for an “Air-Cooled” Shrouded Rotating Disk System With Radial-Clearance Seals

1983 ◽  
Vol 105 (1) ◽  
pp. 178-182 ◽  
Author(s):  
U. P. Phadke ◽  
J. M. Owen
Keyword(s):  
Rotating Disk ◽  
Turbine Rotor ◽  
Radial Clearance ◽  
Pressure Measurements ◽  
Clearance Ratio ◽  
Disk System ◽  
Hot Gas ◽  
Isothermal Plane ◽  
Axial Clearance ◽  
Equivalent Conditions

In order to model the flow between an air-cooled gas turbine rotor and its stationary casing, a simple isothermal plane rotating disk and stator are used. In tests reported earlier, the cavity between the rotor and stator was sealed by a stationary cylindrical shroud, and the dimensionless minimum amount of “coolant,” Cw, min, necessary to prevent a radial inflow (or ingress) of “hot gas” through the axial clearance between the shroud and the rotor, was determined. In the current tests, a number of seals with a radial clearance between the cylindrical shroud and the rotor are tested. Unlike their axial-clearance counterparts, radial-clearance seals can exhibit a pressure-inversion effect, where the pressure inside the cavity increases, rather than decreases, with increasing rotational speed. Using pressure measurements and flow visualization, correlations showing the variation of Cw, min with clearance ratio and rotational Reynolds number are presented, and it is shown that — under equivalent conditions — a seal with a radial clearance can be much more effective than one with an axial clearance.

Transfer of Heat in Rotating Systems

1976 ◽  
Author(s):  
A. D. Gosman ◽  
M. L. Koosinlin ◽  
F. C. Lockwood ◽  
D. B. Spalding
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Fluid Flow ◽  
Rotating Disk ◽  
Experimental Measurements ◽  
Steady Flows ◽  
Disk System ◽  
Rotating Systems ◽  
Flow And Heat Transfer ◽  
Layer Flow

A calculation procedure has been developed for predicting fluid-flow and heat-transfer phenomena in axisymmetrical, rotating, turbulent, steady flows, with special reference to those mainly confined within cavities. The procedure has been used for predicting boundary-layer flow between a rotating disk and a stationary one, and flow and heat transfer in a shrouded-disk system. Agreement with experimental measurements is satisfactory.

Dynamic field testing of coating chemistry candidates by a rotating disk system

Biofouling ◽  
2018 ◽  
Vol 34 (4) ◽  
pp. 398-409 ◽  
Author(s):  
Kim A. Nolte ◽  
Julian Koc ◽  
J.M. Barros ◽  
Kelli Hunsucker ◽  
Michael P. Schultz ◽  
...  
Keyword(s):  
Rotating Disk ◽  
Field Testing ◽  
Disk System ◽  
Dynamic Field

Friction Drag on Bladed Disks in Housings as a Function of Reynolds Number, Axial and Radial Clearance, and Blade Aspect Ratio and Solidity

1961 ◽  
Vol 83 (4) ◽  
pp. 719-723 ◽  
Author(s):  
Robert W. Mann ◽  
Charles H. Marston
Keyword(s):  
Reynolds Number ◽  
Aspect Ratio ◽  
Rotating Disk ◽  
Radial Clearance ◽  
Disk Radius ◽  
Moment Coefficient ◽  
Aspect Ratios ◽  
Direct Measurements ◽  
Partial Admission ◽  
The Moment

Extra losses from partial admission operation of a gas turbine occur both in the nozzle flow arc and away from it. The latter have been related to the theory of fluid flow over a rotating disk expressing a dimensionless moment coefficient as a function of Reynolds number. By direct measurements of drag torque, the moment coefficient has been determined over a range of Reynolds number from 2.0 × 104 to 4.5 × 106 for several aspect ratios, axial and radial shroud clearances, and solidities. Losses increase with increasing aspect ratio. Small increases from minimum practical clearance have little effect, but blade pumping losses become severe at radial and axial clearances of the order of half the disk radius. Typical changes in solidity have only small effects on losses.

Recovery of trypsin inhibitor by soy milk ultrafiltration using a rotating disk system

Desalination ◽  
2006 ◽  
Vol 191 (1-3) ◽  
pp. 438-445 ◽  
Author(s):  
O. Akoum ◽  
D. Richfield ◽  
M.Y. Jaffrin ◽  
L.H. Ding ◽  
P. Swart
Keyword(s):  
Trypsin Inhibitor ◽  
Rotating Disk ◽  
Soy Milk ◽  
Disk System

Dynamic Characteristics of the Radial Clearance Flow Between Axially Oscillating Rotational Disk and Stationary Disk

2009 ◽  
Author(s):  
Hironori Horiguchi ◽  
Yoshinori Ueno ◽  
Koutaro Takahashi ◽  
Kazuyoshi Miyagawa ◽  
Yoshinobu Tsujimoto
Keyword(s):  
Dynamic Characteristics ◽  
Pressure Fluctuation ◽  
Pressure Fluctuations ◽  
Rotating Disk ◽  
Radial Clearance ◽  
Outlet Pressure ◽  
Stationary Disk ◽  
Axial Oscillation ◽  
Clearance Flow ◽  
Stiffness And Damping

Dynamic characteristics of the clearance flow between an axially oscillating rotational disk and a stationary disk were examined by experiments and computations based on a bulk flow model. In the case without pressure fluctuations at the inlet and outlet of the clearance, parallel and contracting flow paths had an effect to stabilize the axial oscillation of the rotating disk. The enlarged flow path had an effect to destabilize the axial oscillation due to the negative damping and stiffness for outward and inward flows, respectively. It was shown that the fluid force can be decomposed into the component caused by the inlet or outlet pressure fluctuation without the axial oscillation and that due to the axial oscillation without the inlet or outlet pressure fluctuation. A method to predict the stiffness and damping coefficients is proposed for general cases when the device is combined with an arbitrary flow system.

Effect of Radial Location of Nozzles on Heat Transfer in Preswirl Cooling Systems

2010 ◽  
Vol 133 (2) ◽  
Author(s):  
V. U. Kakade ◽  
G. D. Lock ◽  
M. Wilson ◽  
J. M. Owen ◽  
J. E. Mayhew
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer Coefficient ◽  
Rotating Disk ◽  
High Heat ◽  
Thermochromic Liquid Crystal ◽  
Disk System ◽  
Dimensional Solution ◽  
Flow Rates ◽  
Measure Surface Temperature ◽  
High Heat Transfer

This paper investigates heat transfer in a rotating disk system using preswirled cooling air from nozzles at high and low radius. The experiments were conducted over a range of rotational speeds, flow rates, and preswirl ratios. Narrow-band thermochromic liquid crystal (TLC) was specifically calibrated for application to experiments on a disk, rotating at ∼5000 rpm and subsequently used to measure surface temperature in a transient experiment. The TLC was viewed through the transparent polycarbonate disk using a digital video camera and strobe light synchronized to the disk frequency. The convective heat transfer coefficient h was subsequently calculated from the one-dimensional solution of Fourier's conduction equation for a semi-infinite wall. The analysis was accounted for the exponential rise in the air temperature driving the heat transfer, and for the experimental uncertainties in the measured values of h. The experimental data was supported by “flow visualization,” determined from CFD. Two heat transfer regimes were revealed for the low-radius preswirl system: a viscous regime at relatively low coolant flow rates, and an inertial regime at higher flow rates. Both regimes featured regions of high heat transfer where thin, boundary layers replaced air exiting through receiver holes at high radius on the rotating disk. The heat transfer in the high-radius preswirl system was shown to be dominated by impingement under the flow conditions tested.

Plasmon-Enhanced Performance of an Array of Core-Shell Silver Nanoparticles Photodeposited onto a Titanium Dioxide Layer

2016 ◽  
Vol 860 ◽  
pp. 35-38
Author(s):  
Chou Chau Yuan-Fong
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Incident Angle ◽  
Three Dimensional ◽  
Rotating Disk ◽  
Core Shell ◽  
Disk System ◽  
Photocatalytic Reactor ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

A plasmonic photocatalytic reactor which composed of a periodic array of core-shell silver nanoparticles (CSSNPs) photodeposited onto a Titanium Dioxide (TiO2) thin film in a multilayer rotating-disk system was numerically investigated by using three-dimensional finite element method. Results show that the proposed structure can exhibit much higher photocalytic activity in a broad range of incident angle of light that are not observed for the same counterpart without the CSSNPs on the SiO2 surface. The enhanced electric field distribution and intensity could be expanded as the inner diameter of CSSNPs and incident angle of light increased.

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