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Dara W. Childs
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Journal Articles

Measured Leakage and Rotordynamic Force Coefficients for Two Liquid Annular Seal Configurations: Smooth-Rotor/Grooved-Stator Versus Grooved-Rotor/Smooth-Stator

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Dara W. Childs, Jing Yang, Luis San Andrés, Jose M. Torres Rueda, James Alex Moreland
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2023, 145(3): 031005.
Paper No: GTP-22-1435
https://doi.org/10.1115/1.4055638
Published Online: December 5, 2022
View Articletitled, Measured Leakage and Rotordynamic Force Coefficients for Two Liquid Annular Seal Configurations: Smooth-Rotor/Grooved-Stator Versus Grooved-Rotor/Smooth-Stator
Open the PDF for Measured Leakage and Rotordynamic Force Coefficients for Two Liquid Annular Seal Configurations: Smooth-Rotor/Grooved-Stator Versus Grooved-Rotor/Smooth-Stator in another window
Topics: Leakage, Rotors, Stators, Stiffness, Damping, Pumps
Journal Articles

Effects of Increased Tooth Clearance on the Performance of a Labyrinth Seal With Oil-Rich Bubbly Laminar Flow

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Min Zhang, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2021, 143(11): 111007.
Paper No: GTP-21-1278
https://doi.org/10.1115/1.4051914
Published Online: September 27, 2021
View Articletitled, Effects of Increased Tooth Clearance on the Performance of a Labyrinth Seal With Oil-Rich Bubbly Laminar Flow
Open the PDF for Effects of Increased Tooth Clearance on the Performance of a Labyrinth Seal With Oil-Rich Bubbly Laminar Flow in another window
Topics: Clearances (Engineering), Flow (Dynamics), Leakage, Pumps, Rotors, Stiffness, Stators, Fluids, Pressure drop, Laminar flow
Journal Articles

Performance of a Long Smooth Multiphase Pump Seal in Different Flow Regimes

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Min Zhang, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2021, 143(11): 111009.
Paper No: GTP-21-1280
https://doi.org/10.1115/1.4051952
Published Online: September 27, 2021
View Articletitled, Performance of a Long Smooth Multiphase Pump Seal in Different Flow Regimes
Open the PDF for Performance of a Long Smooth Multiphase Pump Seal in Different Flow Regimes in another window
Topics: Flow (Dynamics), Turbulence, Laminar flow, Pumps
Journal Articles

Test Results for the Static and Rotordynamic Characteristics of a Long ( L/D = 0.75) Smooth Seal in Two-Phase (Mainly Gas) Conditions With a 62-Bar Inlet Pressure

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Dung L. Tran, Dara W. Childs, Hari Shrestha, Min Zhang
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. April 2021, 143(4): 041010.
Paper No: GTP-20-1638
https://doi.org/10.1115/1.4049773
Published Online: February 26, 2021
View Articletitled, Test Results for the Static and Rotordynamic Characteristics of a Long ( L/D = 0.75) Smooth Seal in Two-Phase (Mainly Gas) Conditions With a 62-Bar Inlet Pressure
Open the PDF for Test Results for the Static and Rotordynamic Characteristics of a Long ( L/D = 0.75) Smooth Seal in Two-Phase (Mainly Gas) Conditions With a 62-Bar Inlet Pressure in another window
Topics: Damping, Flow (Dynamics), Leakage, Pressure, Stiffness, Computational fluid dynamics, Density, Two-phase flow, Viscosity
Journal Articles

Experimental Study on the Performance of a See-Through Labyrinth Seal With Two-Phase, Mainly-Liquid Mixtures

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Min Zhang, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. January 2021, 143(1): 011015.
Paper No: GTP-20-1477
https://doi.org/10.1115/1.4048799
Published Online: January 4, 2021
View Articletitled, Experimental Study on the Performance of a See-Through Labyrinth Seal With Two-Phase, Mainly-Liquid Mixtures
Open the PDF for Experimental Study on the Performance of a See-Through Labyrinth Seal With Two-Phase, Mainly-Liquid Mixtures in another window
Topics: Flow (Dynamics), Fluids, Leakage, Pumps, Rotors, Stiffness, Pressure, Clearances (Engineering), Damping, Friction
Journal Articles

Effects of Clearance on the Performance of a Labyrinth Seal Under Wet-Gas Conditions

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Min Zhang, Dara W. Childs, Dung L. Tran, Hari Shresth
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2020, 142(11): 111012.
Paper No: GTP-20-1479
https://doi.org/10.1115/1.4048797
Published Online: October 28, 2020
View Articletitled, Effects of Clearance on the Performance of a Labyrinth Seal Under Wet-Gas Conditions
Open the PDF for Effects of Clearance on the Performance of a Labyrinth Seal Under Wet-Gas Conditions in another window
Topics: Clearances (Engineering), Compressors, Flow (Dynamics), Fluids, Leakage, Pressure, Rotors, Stiffness, Damping, Whirls
Journal Articles

Discussion of “Non-Axisymmetric Flows and Rotordynamic Forces in an Eccentric Shrouded Centrifugal Compressor—Part 2: Analysis” (Song, J., and Song S. J., ASME J. Eng. Gas Turbines Power, 141(11), p. 111015)

Open Access
Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Discussions
J. Eng. Gas Turbines Power. October 2020, 142(10): 105502.
Paper No: GTP-19-1575
https://doi.org/10.1115/1.4047372
Published Online: September 29, 2020
View Articletitled, Discussion of “Non-Axisymmetric Flows and Rotordynamic Forces in an Eccentric Shrouded Centrifugal Compressor—Part 2: Analysis” (Song, J., and Song S. J., ASME J. Eng. Gas Turbines Power, 141(11), p. 111015)
Open the PDF for Discussion of “Non-Axisymmetric Flows and Rotordynamic Forces in an Eccentric Shrouded Centrifugal Compressor—Part 2: Analysis” (Song, J., and Song S. J., ASME J. Eng. Gas Turbines Power, 141(11), p. 111015) in another window
Topics: Compressors, Flow (Dynamics), Gas turbines
Journal Articles

Discussion of “Non-Axisymmetric Flows and Rotordynamic Forces in an Eccentric Shrouded Centrifugal Compressor—Part 1: Measurement” (Song, J., Kim, S., Park, T. C., Cha, B.-J., Lim, D. H., Hong, J. S., Lee, T. W., and Song, S. J., ASME J. Eng. Gas Turbines Power, 141(11), p. 111014)

Open Access
Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Discussions
J. Eng. Gas Turbines Power. October 2020, 142(10): 105501.
Paper No: GTP-19-1574
https://doi.org/10.1115/1.4047370
Published Online: September 29, 2020
View Articletitled, Discussion of “Non-Axisymmetric Flows and Rotordynamic Forces in an Eccentric Shrouded Centrifugal Compressor—Part 1: Measurement” (Song, J., Kim, S., Park, T. C., Cha, B.-J., Lim, D. H., Hong, J. S., Lee, T. W., and Song, S. J., ASME J. Eng. Gas Turbines Power, 141(11), p. 111014)
Open the PDF for Discussion of “Non-Axisymmetric Flows and Rotordynamic Forces in an Eccentric Shrouded Centrifugal Compressor—Part 1: Measurement” (Song, J., Kim, S., Park, T. C., Cha, B.-J., Lim, D. H., Hong, J. S., Lee, T. W., and Song, S. J., ASME J. Eng. Gas Turbines Power, 141(11), p. 111014) in another window
Topics: Compressors, Flow (Dynamics), Gas turbines
Journal Articles

Preswirl and Mixed-Flow (Mainly Liquid) Effects on Rotordynamic Performance of a Long ( L / D  = 0.75) Smooth Seal

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Dung L. Tran, Dara W. Childs, Hari Shrestha, Min Zhang
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2020, 142(3): 031012.
Paper No: GTP-19-1318
https://doi.org/10.1115/1.4044291
Published Online: January 29, 2020
View Articletitled, Preswirl and Mixed-Flow (Mainly Liquid) Effects on Rotordynamic Performance of a Long ( L / D  = 0.75) Smooth Seal
Open the PDF for Preswirl and Mixed-Flow (Mainly Liquid) Effects on Rotordynamic Performance of a Long ( L / D  = 0.75) Smooth Seal in another window
Topics: Damping, Flow (Dynamics), Stiffness, Pressure, Fluids
Journal Articles

A Study for Rotordynamic and Leakage Characteristics of a Long-Honeycomb Seal With Two-Phase, Mainly Air Mixtures

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Min Zhang, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. January 2020, 142(1): 011021.
Paper No: GTP-19-1396
https://doi.org/10.1115/1.4044947
Published Online: December 12, 2019
View Articletitled, A Study for Rotordynamic and Leakage Characteristics of a Long-Honeycomb Seal With Two-Phase, Mainly Air Mixtures
Open the PDF for A Study for Rotordynamic and Leakage Characteristics of a Long-Honeycomb Seal With Two-Phase, Mainly Air Mixtures in another window
Topics: Flow (Dynamics), Honeycomb structures, Leakage, Rotors, Pressure, Compressors, Damping, Excitation, Fluids, Clearances (Engineering)
Journal Articles

A Study on the Leakage and Rotordynamic Coefficients of a Long-Smooth Seal With Laminar-Two-Phase, Mainly-Oil Mixtures

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Min Zhang, Dara W. Childs, Dung L. Tran, Hari Shrestha
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. January 2020, 142(1): 011020.
Paper No: GTP-19-1395
https://doi.org/10.1115/1.4044946
Published Online: December 12, 2019
View Articletitled, A Study on the Leakage and Rotordynamic Coefficients of a Long-Smooth Seal With Laminar-Two-Phase, Mainly-Oil Mixtures
Open the PDF for A Study on the Leakage and Rotordynamic Coefficients of a Long-Smooth Seal With Laminar-Two-Phase, Mainly-Oil Mixtures in another window
Topics: Flow (Dynamics), Laminar flow, Leakage, Stiffness, Rotors
Journal Articles

A Study on the Leakage and Rotordynamic Performance of a Long Labyrinth Seal Under Mainly Air Conditions

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Min Zhang, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. December 2019, 141(12): 121024.
Paper No: GTP-19-1199
https://doi.org/10.1115/1.4045257
Published Online: November 20, 2019
View Articletitled, A Study on the Leakage and Rotordynamic Performance of a Long Labyrinth Seal Under Mainly Air Conditions
Open the PDF for A Study on the Leakage and Rotordynamic Performance of a Long Labyrinth Seal Under Mainly Air Conditions in another window
Topics: Compressors, Damping, Leakage, Rotors, Stators, Stiffness, Pressure, Stability, Excitation, Fluids
Journal Articles

Experimental Study of the Static and Dynamic Characteristics of a Long ( L/D  = 0.75) Labyrinth Annular Seal Operating Under Two-Phase (Liquid/Gas) Conditions

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Hari Shrestha, Dara W. Childs, Dung L. Tran, Min Zhang
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2019, 141(11): 111002.
Paper No: GTP-19-1319
https://doi.org/10.1115/1.4044309
Published Online: September 16, 2019
View Articletitled, Experimental Study of the Static and Dynamic Characteristics of a Long ( L/D  = 0.75) Labyrinth Annular Seal Operating Under Two-Phase (Liquid/Gas) Conditions
Open the PDF for Experimental Study of the Static and Dynamic Characteristics of a Long ( L/D  = 0.75) Labyrinth Annular Seal Operating Under Two-Phase (Liquid/Gas) Conditions in another window
Topics: Compressors, Damping, Flow (Dynamics), Pressure, Rotors, Stiffness, Stators, Leakage, Stability, Silicones
Journal Articles

Measurements Versus Predictions for a Hybrid (Hydrostatic Plus Hydrodynamic) Thrust Bearing for a Range of Orifice Diameters

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Dara W. Childs, Paul Esser
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. June 2019, 141(6): 061015.
Paper No: GTP-18-1432
https://doi.org/10.1115/1.4042721
Published Online: February 21, 2019
View Articletitled, Measurements Versus Predictions for a Hybrid (Hydrostatic Plus Hydrodynamic) Thrust Bearing for a Range of Orifice Diameters
Open the PDF for Measurements Versus Predictions for a Hybrid (Hydrostatic Plus Hydrodynamic) Thrust Bearing for a Range of Orifice Diameters in another window
Topics: Bearings, Clearances (Engineering), Flow (Dynamics), Pressure, Stress, Thrust bearings, Stiffness, Rotors, Hydrostatics
Journal Articles

Static and Rotordynamic Analysis of a Plain Annular (Liquid) Seal in the Laminar Regime With a Swirl Brake for Three Clearances

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Ovais Ahmed Bin Najeeb, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. August 2019, 141(8): 081002.
Paper No: GTP-18-1557
https://doi.org/10.1115/1.4042650
Published Online: February 11, 2019
View Articletitled, Static and Rotordynamic Analysis of a Plain Annular (Liquid) Seal in the Laminar Regime With a Swirl Brake for Three Clearances
Open the PDF for Static and Rotordynamic Analysis of a Plain Annular (Liquid) Seal in the Laminar Regime With a Swirl Brake for Three Clearances in another window
Topics: Brakes, Clearances (Engineering), Rotors, Stators, Stiffness, Stress, Fluids, Pumps
Journal Articles

Clearance Effects on Rotordynamic Performance of a Long Smooth Seal With Two-Phase, Mainly-Air Mixtures

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Min Zhang, Dara W. Childs, Dung L. Tran, Hari Shrestha
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. January 2019, 141(1): 012502.
Paper No: GTP-17-1637
https://doi.org/10.1115/1.4040809
Published Online: October 29, 2018
View Articletitled, Clearance Effects on Rotordynamic Performance of a Long Smooth Seal With Two-Phase, Mainly-Air Mixtures
Open the PDF for Clearance Effects on Rotordynamic Performance of a Long Smooth Seal With Two-Phase, Mainly-Air Mixtures in another window
Topics: Clearances (Engineering), Compressors, Damping, Excitation, Flow (Dynamics), Fluids, Leakage, Performance, Rotors, Stators
Journal Articles

Lateral Equilibrium Position Analysis Program With Applications to Electric Submersible Pumps

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Clay S. Norrbin, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. June 2018, 140(6): 062602.
Paper No: GTP-17-1478
https://doi.org/10.1115/1.4038482
Published Online: January 17, 2018
View Articletitled, Lateral Equilibrium Position Analysis Program With Applications to Electric Submersible Pumps
Open the PDF for Lateral Equilibrium Position Analysis Program With Applications to Electric Submersible Pumps in another window
Topics: Cathodic protection, Displacement, Equilibrium (Physics), Fluids, Pumps, Rotors, Submersibles, Stiffness, Stability, Rotordynamics
Journal Articles

Experimental Study of the Static and Dynamic Characteristics of a Long Smooth Seal With Two-Phase, Mainly Air Mixtures

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Min Zhang, James E. Mclean, Jr, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. December 2017, 139(12): 122504.
Paper No: GTP-17-1263
https://doi.org/10.1115/1.4037607
Published Online: September 13, 2017
View Articletitled, Experimental Study of the Static and Dynamic Characteristics of a Long Smooth Seal With Two-Phase, Mainly Air Mixtures
Open the PDF for Experimental Study of the Static and Dynamic Characteristics of a Long Smooth Seal With Two-Phase, Mainly Air Mixtures in another window
Topics: Damping, Flow (Dynamics), Leakage, Pressure, Stators, Stiffness, Rotors, Excitation, Fluids, Silicones
Journal Articles

Characteristics of a Spherical Seat TPJB With Four Methods of Directed Lubrication—Part II: Rotordynamic Performance

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David M. Coghlan, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. December 2017, 139(12): 122503.
Paper No: GTP-17-1153
https://doi.org/10.1115/1.4036970
Published Online: August 23, 2017
View Articletitled, Characteristics of a Spherical Seat TPJB With Four Methods of Directed Lubrication—Part II: Rotordynamic Performance
Open the PDF for Characteristics of a Spherical Seat TPJB With Four Methods of Directed Lubrication—Part II: Rotordynamic Performance in another window
Topics: Bearings, Damping, Lubrication, Stiffness, Stress
Journal Articles

Characteristics of a Spherical-Seat TPJB With Four Methods of Directed Lubrication—Part I: Thermal and Static Performance

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David M. Coghlan, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. December 2017, 139(12): 122502.
Paper No: GTP-17-1152
https://doi.org/10.1115/1.4036969
Published Online: August 23, 2017
View Articletitled, Characteristics of a Spherical-Seat TPJB With Four Methods of Directed Lubrication—Part I: Thermal and Static Performance
Open the PDF for Characteristics of a Spherical-Seat TPJB With Four Methods of Directed Lubrication—Part I: Thermal and Static Performance in another window
Topics: Bearings, Stress, Temperature, Lubrication, Clearances (Engineering), Rotors