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Njuki Mureithi
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Journal Articles

Investigation of Fluidelastic Instability of Fuel Rod Bundles Subjected to Combined Axial Flow and Jet Crossflow

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Bastien Chevalier, Njuki Mureithi, Ibrahim Gad- El-Hak, Kostas Karazis
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. February 2025, 147(1): 011404.
Paper No: PVT-24-1015
https://doi.org/10.1115/1.4067308
Published Online: January 3, 2025
View Articletitled, Investigation of Fluidelastic Instability of Fuel Rod Bundles Subjected to Combined Axial Flow and Jet Crossflow
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Topics: Axial flow, Fuel rods, Flow-induced vibrations, Flow (Dynamics)
Proceedings Papers

Effect of Pitch Spacing on Fluidelastic Forces in a Rotated Triangular Array

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Sameh Darwish, Njuki Mureithi, Minki Cho
Proc. ASME. PVP2023, Volume 3: Fluid-Structure Interaction, V003T04A018, July 16–21, 2023
Publisher: American Society of Mechanical Engineers
Paper No: PVP2023-106888
https://doi.org/10.1115/PVP2023-106888
View Paper titled, Effect of Pitch Spacing on Fluidelastic Forces in a Rotated Triangular Array
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Topics: Boilers, Cross-flow, Damping, Fluids, Force measurement, Vibration, Water
Proceedings Papers

Experimental Investigation of Combined Axial Flow and Jet Cross-Flow on PWR Mock-Up Array

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Ibrahim Gad-el-Hak, Njuki Mureithi, Kostas Karazis
Proc. ASME. PVP2023, Volume 3: Fluid-Structure Interaction, V003T04A019, July 16–21, 2023
Publisher: American Society of Mechanical Engineers
Paper No: PVP2023-107312
https://doi.org/10.1115/PVP2023-107312
View Paper titled, Experimental Investigation of Combined Axial Flow and Jet Cross-Flow on PWR Mock-Up Array
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Topics: Axial flow, Cross-flow, Fuel rods, Jets, Pressurized water reactors, Stability
Proceedings Papers

Evaluation of Fuel Rod Response Using Principal Component Analysis

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Ibrahim Gad-el-Hak, Njuki Mureithi, Kostas Karazis
Proc. ASME. IMECE2022, Volume 5: Dynamics, Vibration, and Control, V005T07A043, October 30–November 3, 2022
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2022-96808
https://doi.org/10.1115/IMECE2022-96808
View Paper titled, Evaluation of Fuel Rod Response Using Principal Component Analysis
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Topics: Cross-flow, Fuel rods, Pressurized water reactors, Principal component analysis, Vibration
Journal Articles

Equivalent Theodorsen Function for Fluidelastic Excitation in a Normal Triangular Array

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Loay Alyaldin, Njuki Mureithi
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. December 2022, 144(6): 061401.
Paper No: PVT-21-1143
https://doi.org/10.1115/1.4053996
Published Online: March 24, 2022
View Articletitled, Equivalent Theodorsen Function for Fluidelastic Excitation in a Normal Triangular Array
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Topics: Damping, Delays, Flow (Dynamics), Fluids, Stability, Water, Excitation, Vibration, Nuclear reactor steam generators
Journal Articles

Flow-Induced Vibrations of a Rotated Square Tube Array Subjected to Single-Phase Cross-Flow

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Sameh Darwish, Abdallah Hadji, H. P. Pham, Njuki Mureithi, Minki Cho
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. August 2022, 144(4): 041405.
Paper No: PVT-21-1139
https://doi.org/10.1115/1.4053164
Published Online: January 13, 2022
View Articletitled, Flow-Induced Vibrations of a Rotated Square Tube Array Subjected to Single-Phase Cross-Flow
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Topics: Cross-flow, Flow (Dynamics), Flow-induced vibrations, Vibration, Spectra (Spectroscopy), Water, Vorticity, Excitation
Proceedings Papers

Experimental Investigation of Jet Cross-Flow Induced Vibration of a Rod Bundle

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Ibrahim Gad-el-Hak, Njuki Mureithi, Kostas Karazis, Gary Williams
Proc. ASME. PVP2021, Volume 3: Fluid Structure Interaction; High Pressure Technology, V003T04A014, July 13–15, 2021
Publisher: American Society of Mechanical Engineers
Paper No: PVP2021-65000
https://doi.org/10.1115/PVP2021-65000
View Paper titled, Experimental Investigation of Jet Cross-Flow Induced Vibration of a Rod Bundle
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Topics: Accidents, Coolants, Cross-flow, Fuel rods, Jets, Pressurized water reactors, Vibration
Proceedings Papers

Equivalent Theodorsen Function for Fluidelastic Excitation in a Normal Triangular Array

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Loay Alyaldin, Njuki Mureithi
Proc. ASME. PVP2019, Volume 4: Fluid-Structure Interaction, V004T04A029, July 14–19, 2019
Publisher: American Society of Mechanical Engineers
Paper No: PVP2019-94010
https://doi.org/10.1115/PVP2019-94010
View Paper titled, Equivalent Theodorsen Function for Fluidelastic Excitation in a Normal Triangular Array
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Topics: Cross-flow, Delays, Excitation, Flow (Dynamics), Fluids, Gases, Heat exchangers, Stability
Proceedings Papers

A Quasi-Steady In-Plane Fluidelastic Instability Analysis of a Rotated Triangular Tube Array in Two-Phase Cross Flow

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Stephen Olala, Njuki Mureithi
Proc. ASME. PVP2018, Volume 4: Fluid-Structure Interaction, V004T04A017, July 15–20, 2018
Publisher: American Society of Mechanical Engineers
Paper No: PVP2018-85143
https://doi.org/10.1115/PVP2018-85143
View Paper titled, A Quasi-Steady In-Plane Fluidelastic Instability Analysis of a Rotated Triangular Tube Array in Two-Phase Cross Flow
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Topics: Cross-flow, Degrees of freedom, Delays, Displacement, Drag (Fluid dynamics), Hydraulic couplings, Stiffness, Two-phase flow
Proceedings Papers

Characteristics of Turbulence and Drag Forces on Foreign Objects in Tube Arrays

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Njuki Mureithi, Bastien Cucuel, Karim Saber-Cherif, Stephen Olala, Farzad Ashrafi
Proc. ASME. PVP2016, Volume 4: Fluid-Structure Interaction, V004T04A018, July 17–21, 2016
Publisher: American Society of Mechanical Engineers
Paper No: PVP2016-63994
https://doi.org/10.1115/PVP2016-63994
View Paper titled, Characteristics of Turbulence and Drag Forces on Foreign Objects in Tube Arrays
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Topics: Drag (Fluid dynamics), Turbulence, Fluids, Wear, Boilers, Geometry, Force measurement, Wind tunnels
Journal Articles

Identification of Friction Model Parameters Using the Inverse Harmonic Method

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Abdallah Hadji, Njuki Mureithi
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. April 2017, 139(2): 021209.
Paper No: PVT-15-1225
https://doi.org/10.1115/1.4034441
Published Online: September 29, 2016
View Articletitled, Identification of Friction Model Parameters Using the Inverse Harmonic Method
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Topics: Friction, Excitation
Proceedings Papers

Validation of Friction Model Parameters Identified Using the Inverse Harmonic Balance Method

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Abdallah Hadji, Njuki Mureithi
Proc. ASME. PVP2015, Volume 4: Fluid-Structure Interaction, V004T04A041, July 19–23, 2015
Publisher: American Society of Mechanical Engineers
Paper No: PVP2015-45627
https://doi.org/10.1115/PVP2015-45627
View Paper titled, Validation of Friction Model Parameters Identified Using the Inverse Harmonic Balance Method
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Topics: Friction, Finite element methods, Coulombs, Displacement, Simulation, Stiction, Vibration
Proceedings Papers

Nonlinear Normal Modes and the LuGre Friction Model Parameter Identification

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Abdallah Hadji, Njuki Mureithi
Proc. ASME. IMECE2014, Volume 4A: Dynamics, Vibration, and Control, V04AT04A078, November 14–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2014-38997
https://doi.org/10.1115/IMECE2014-38997
View Paper titled, Nonlinear Normal Modes and the LuGre Friction Model Parameter Identification
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Topics: Friction, Displacement, Fourier series, Modal analysis, Signal reconstruction, Vibration
Proceedings Papers

Nonlinear Normal Modes and the Dahl Friction Model Parameter Identification

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Abdallah Hadji, Njuki Mureithi
Proc. ASME. PVP2014, Volume 4: Fluid-Structure Interaction, V004T04A064, July 20–24, 2014
Publisher: American Society of Mechanical Engineers
Paper No: PVP2014-28733
https://doi.org/10.1115/PVP2014-28733
View Paper titled, Nonlinear Normal Modes and the Dahl Friction Model Parameter Identification
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Topics: Friction, Boilers, Displacement, Excitation, Vibration, Accelerometers, Errors, Fluid dynamics, Fourier series, Lubrication
Proceedings Papers

Implementation in VIBIC of an Improved Time-Domain Simulation Model for Fluidelastic Instability in Tube Arrays

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Teguewinde Sawadogo, Yingke Han, Njuki Mureithi
Proc. ASME. PVP2014, Volume 4: Fluid-Structure Interaction, V004T04A067, July 20–24, 2014
Publisher: American Society of Mechanical Engineers
Paper No: PVP2014-28783
https://doi.org/10.1115/PVP2014-28783
View Paper titled, Implementation in VIBIC of an Improved Time-Domain Simulation Model for Fluidelastic Instability in Tube Arrays
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Topics: Boilers, Collaboration, Computers, Damage, Delay differential equations, Delays, Displacement, Excitation, Flow (Dynamics), Fluids
Journal Articles

A Simple Empirical Model for Tube–Support Normal Impact Interaction

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Reza Azizian, Njuki Mureithi
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. October 2014, 136(5): 051303.
Paper No: PVT-12-1168
https://doi.org/10.1115/1.4027797
Published Online: August 19, 2014
View Articletitled, A Simple Empirical Model for Tube–Support Normal Impact Interaction
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Topics: Computer simulation, Damping, Displacement, Energy dissipation, Excitation, Dynamics (Mechanics), Stiffness, Errors, Vibration, Computation
Journal Articles

Numerical Analysis of Fretting-Wear With a Hybrid Elastoplastic Friction Model

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Reza Azizian, Njuki Mureithi
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. June 2014, 136(3): 031303.
Paper No: PVT-12-1074
https://doi.org/10.1115/1.4025446
Published Online: February 28, 2014
View Articletitled, Numerical Analysis of Fretting-Wear With a Hybrid Elastoplastic Friction Model
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Topics: Friction, Springs
Proceedings Papers

A Method for Extracting the Time Delay From the Unsteady and Quasi-Steady Fluidelastic Forces in Two-Phase Flow

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Teguewinde Sawadogo, Njuki Mureithi
Proc. ASME. PVP2013, Volume 4: Fluid-Structure Interaction, V004T04A042, July 14–18, 2013
Publisher: American Society of Mechanical Engineers
Paper No: PVP2013-97437
https://doi.org/10.1115/PVP2013-97437
View Paper titled, A Method for Extracting the Time Delay From the Unsteady and Quasi-Steady Fluidelastic Forces in Two-Phase Flow
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Topics: Delays, Two-phase flow, Fluids, Flow (Dynamics), Excitation, Boilers, Chaos, Convection, Damping, Linear motors
Proceedings Papers

A Hybrid Friction Model for Dynamic Modeling of Stick-Slip Behaviour

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Reza Azizian, Njuki Mureithi
Proc. ASME. PVP2013, Volume 4: Fluid-Structure Interaction, V004T04A031, July 14–18, 2013
Publisher: American Society of Mechanical Engineers
Paper No: PVP2013-97249
https://doi.org/10.1115/PVP2013-97249
View Paper titled, A Hybrid Friction Model for Dynamic Modeling of Stick-Slip Behaviour
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Topics: Dynamic modeling, Friction, Stick-slip, Wear, Dampers, Failure, Heat exchangers, Shear stress, Springs
Proceedings Papers

An Exploratory Experimental Technique to Predict Two-Phase Flow Pattern From Vibration Response

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Luis Enrique Ortiz-Vidal, Oscar M. H. Rodriguez, Njuki Mureithi
Proc. ASME. PVP2013, Volume 4: Fluid-Structure Interaction, V004T04A061, July 14–18, 2013
Publisher: American Society of Mechanical Engineers
Paper No: PVP2013-98115
https://doi.org/10.1115/PVP2013-98115
View Paper titled, An Exploratory Experimental Technique to Predict Two-Phase Flow Pattern From Vibration Response
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Topics: Two-phase flow, Vibration, Flow (Dynamics), Slug flows, Pipe flow, Pipes, Bubbly flow, Energy generation, Failure, Flow-induced vibrations