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Martin, H.A. (author), Smits, Edsger C.P. (author), Poelma, René H. (author), van Driel, W.D. (author), Zhang, Kouchi (author)This article introduces an online condition monitoring strategy that utilizes a transient heat pulse to detect package thermal performance degradation. The metric employed is the temperature-dependent transient thermal impedance "Zth(t, Tamb)."The proposed methodology offers quantitative insights into package thermal performance degradation...journal article 2024
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Du, L. (author), Deng, Shanliang (author), Cui, Z. (author), Poelma, René H. (author), Beelen-Hendrikx, Caroline (author), Zhang, Kouchi (author)In this study, we combined finite element method (FEM) based on Ansys and Noesis Optimus software to investigate the effect of bump structures and loading conditions on the electromigration properties of solder bumps in WLCSP. A numerical model considering current density, vacancy concentration, stress and temperature was utilized to calculate...conference paper 2024
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Hu, X. (author), Huang, Jianlin (author), Poelma, René H. (author), van Driel, W.D. (author), Zhang, Kouchi (author)Low-temperature sintering technology of Ag nanoparticles is widely used in high-power electronic device packaging. Utilizing simulation methods to comprehend and control the microstructure and properties of Ag sintering materials has emerged as a prominent research area. This work uses the General Form PDE module in COMSOL to simplify the...conference paper 2024
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Hu, D. (author), Wang, Chieh (author), Li, Z. (author), Gupta, N. (author), Poelma, René H. (author), Shi, Ziliang (author), Fan, J. (author), Zhang, Kouchi (author)Driven by the increasing demand for high-power systems, ceramic substrates have received more attention for handling higher power density. Warpage in active metal brazed (AMB) ceramic substrate becomes a critical issue as it can deteriorate the reliability performance. This study comprises three phases, including investigation of the cause of...conference paper 2024
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Hogendoorn, W.J. (author), Breugem, W.P. (author), Frank, David (author), Bruschewski, Martin (author), Grundmann, Sven (author), Poelma, C. (author)Magnetic resonance imaging (MRI) experiments have been performed in conjunction with direct numerical simulations (DNS) to study neutrally buoyant particle-laden pipe flows. The flows are characterized by the suspension liquid Reynolds number (Res), based on the bulk liquid velocity and suspension viscosity obtained from Eilers' correlation,...journal article 2023
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Martin, H.A. (author), Reintjes, Marcia (author), Reijs, Dave (author), Dorrestein, Sander (author), Kengen, Martien (author), Libon, Sebastien (author), Smits, Edsger (author), Tang, Xiao (author), Koelink, Marco (author), Poelma, René H. (author), van Driel, W.D. (author), Zhang, Kouchi (author)Integrated Circuits and Electronic Modules experience concentrated thermal hot spots, which require advanced thermal solutions for effective distribution and dissipation of heat. The superior thermal properties of diamonds are long known, and it is an ideal material for heat-spreading applications. However, growing diamond films to the...conference paper 2023
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Du, L. (author), Zhao, Xiujuan (author), Poelma, René H. (author), van Driel, W.D. (author), Zhang, Kouchi (author)SnBiAgCu solder alloy is an attractive soldering material for temperature-sensitive electronic devices due to its excellent creep properties. This study firstly reports the creep properties of SnBiAgCu solder alloy under different temperatures. Results show that the addition of Bi resulted in better creep resistance compared with that of...conference paper 2023
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Nyns, Emile C.A. (author), Portero, Vincent (author), Deng, Shanliang (author), Jin, T. (author), Harlaar, Niels (author), Bart, Cindy I. (author), van Brakel, Thomas J. (author), Palmen, Meindert (author), Hjortnaes, Jesper (author), Ramkisoensing, Arti A. (author), Zhang, Kouchi (author), Poelma, René H. (author), Ördög, Balázs (author), de Vries, Antoine A.F. (author), Pijnappels, Daniël A. (author)Background: Optogenetics could offer a solution to the current lack of an ambulatory method for the rapid automated cardioversion of atrial fibrillation (AF), but key translational aspects remain to be studied. Objective: To investigate whether optogenetic cardioversion of AF is effective in the aged heart and whether sufficient light...journal article 2023
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Nagalingam, Nagaraj (author), Raghunathan, Aswin (author), Korede, V.B. (author), Poelma, C. (author), Smith, C.S. (author), Hartkamp, Remco (author), Padding, J.T. (author), Eral, H.B. (author)We demonstrate that a cavitation bubble initiated by a Nd:YAG laser pulse below breakdown threshold induces crystallization from supersaturated aqueous solutions with supersaturation and laser-energy-dependent nucleation kinetics. Combining high-speed video microscopy and simulations, we argue that a competition between the dissipation of...journal article 2023
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Cornel, W.A. (author), Westerweel, J. (author), Poelma, C. (author)Abstract: A novel experimental imaging-based method is presented for the non-intrusive determination of shock wave characteristics (i.e. shock wave speed and magnitude, and shock-induced liquid velocity) in a bubbly flow solely from gas bubble velocities. Shock wave speeds are estimated by the relative motion between gas bubbles at two...journal article 2023
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Hu, X. (author), Martin, H.A. (author), Poelma, René H. (author), Huang, J.L. (author), Rijckevorsel, H. (author), Scholten, H. (author), Smits, E.C.P. (author), van Driel, W.D. (author), Zhang, Kouchi (author)Resin-reinforced silver (Ag) sintering material is an effective and highly reliable solution for power electronics packaging. The hybrid material’s process parameters strongly influence its microstructure and pose a significant challenge in estimating its effective properties as a thin interconnect layer. This research demonstrates a novel 3D...conference paper 2023
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Yi, H. (author), Öztürk, E. (author), Koelink, Marco (author), Krimmling, Jana (author), Damian, Andrei A. (author), Debski, Wojciech (author), van Zeijl, H.W. (author), Zhang, Kouchi (author), Poelma, René H. (author)High-performance IC-to-antenna interconnection is one of the key enablers for the mass production of high-end millimeter wave (mmW) radar systems above 100 GHz. In this work, a radar system with an on-package antenna array working at 122 GHz is presented. The antenna is placed on top of the molded package and the antenna-to-chip interconnection...journal article 2022
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Muller, K. (author), Greidanus, A.J. (author), Dash, A. (author), Poelma, C. (author)The circular Taylor-Couette flow is one of the archetypical model systems for the study of flow transitions and dynamic pattern formation in experimental fluid dynamics. The emergence of the internal vortical flow structures are commonly visualized through a rheoscopic flow visualization, while their spatio-temporal dynamics can be extracted by...conference paper 2022
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Du, L. (author), Zhao, Xiujuan (author), Watte, Piet (author), Poelma, René H. (author), van Driel, W.D. (author), Zhang, Kouchi (author)The objective of this article is to investigate the thermal-fatigue properties of a commercially available lead-free solder alloy (SnBiAgCu) under the use of different types of potting compounds. Solder alloys with lower silver content are expected to substitute the conventional solder alloys SAC305 (Sn-3.0Ag-0.5Cu). First, the tensile...conference paper 2022
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Hogendoorn, W.J. (author), Chandra, B. (author), Poelma, C. (author)We propose a scaling law for the onset of turbulence in pipe flow of neutrally buoyant suspensions. This scaling law, based on a large set of experimental data, relates the amplitude of the particle-induced perturbations ε to the critical suspension Reynolds number Res,c. Here ε is a function of the particle-to-pipe diameter ratio and the volume...journal article 2022
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Dash, A. (author), Poelma, C. (author)We revisit the laminar–turbulent transition of a fine-grained slurry in a large pipe. The combination of long measurement times in an industrial-scale facility and ultrasound imaging allows us to observe and address anomalous trends. Under turbulent conditions, the flow is homogeneous and steady. However, under laminar conditions, two types of...journal article 2022
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Gawandalkar, U.U. (author), Poelma, C. (author)Abstract: The so-called ‘re-entrant jet’ is fundamental to periodic cloud shedding in partial cavitation. However, the exact physical mechanism governing this phenomenon remains ambiguous. The complicated topology of the re-entrant flow renders whole-field, detailed measurement of the re-entrant flow cumbersome. Hence, most studies in the...journal article 2022
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van Meerkerk, M. (author), Poelma, C. (author), Hofland, Bas (author), Westerweel, J. (author)We present an experimental study on the gas flow field development over a plunging breaking wave prior to impact on a vertical wall. The variability of wave impact pressure over repeated measurements is well known (Bagnold, 1939). The formation of instabilities on the wave crest are postulated to be the main source of impact pressure variability...journal article 2022
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Dash, A. (author), Hogendoorn, W.J. (author), Oldenziel, G. (author), Poelma, C. (author)Abstract: Ultrasound imaging velocimetry (UIV) refers to the technique wherein ultrasound images are analysed with 2D cross-correlation techniques developed originally in the framework of particle image velocimetry. Applying UIV to opaque, particle-laden multiphase flows have long been considered to be an attractive prospect. In this study,...journal article 2022
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- Nyns, Emile C.A. (author), Jin, T. (author), Bart, Cindy I. (author), Bax, Wilhelmina H. (author), Zhang, Kouchi (author), Poelma, René H. (author), de Vries, Antoine A.F. (author), Pijnappels, Daniël A. (author) journal article 2022