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Md. Emadur Rahman

Bio: Md. Emadur Rahman is an academic researcher from Indian Institute of Technology Bombay. The author has contributed to research in topics: Pressure drop & Boiling. The author has an hindex of 2, co-authored 2 publications receiving 18 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a study of non-linear stability analysis using co-dimension two (i.e., two free parameters being varied) bifurcations related to pressure drop oscillations in a heated channel has been carried out.

27 citations

Journal ArticleDOI
TL;DR: In this paper , the authors perform stability analysis using bifurcation theory to determine the effect of various operating and geometric parameters on pressure drop oscillations in micro-channel heat sinks.

8 citations

Proceedings ArticleDOI
04 Oct 2018
TL;DR: In this article, a nodalized reduced order model was developed to analyze the linear stability in a heated channel using supercritical water (SCW) as a coolant, which reduced the requirement of computational efforts and resources.
Abstract: In this paper, a novel nodalized reduced order model (NROM) has been developed to analyze the linear stability in a heated channel using supercritical water (SCW) as a coolant. The presented reduced order model is developed based on the two-phase flow system approach. The model is much simplified, which reduced the requirement of computational efforts and resources. In the heated channel, the SCW’s density shows a dramatic downfall near the pseudo-critical temperature, based on which it has been divided into n number of nodes. The one-dimension partial differentiation conservation equations of energy, mass and momentum are used and have been linearized by a small perturbation applied on its steady-state solution. These PDEs are converted into the corresponding time-dependent, nonlinear ordinary differential equations (ODEs) by using weighted residual method applied under some appropriate assumptions and approximations. These sets of ODEs (n+1 equations) are then solved analytically by using a state space approach to capture the stability boundary (SB) in terms of trans-pseudo-critical phase change number (Ntpc), pseudo-subcooling number (Nspc) by applying a constant external pressure drop (ΔPtpc) condition across the channel. The NROM results are found to be in good agreement with the methodology and have been verified by numerical simulation. To extend this as a nonlinear stability analysis, the different types of the Hopf Bifurcation regime are also reported.

4 citations

Journal ArticleDOI
TL;DR: In this article , the effect of thermal capacitance on the transient thermal response of a heat sink experiencing pressure drop oscillations was examined through use of a dynamic two-phase flow model and experiments.

Cited by
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Journal ArticleDOI
TL;DR: In this article, the interaction of DWO and flow maldistribution in a tri-channel thermal-hydraulic system is analyzed. But the authors focus on the two and three-channel systems.

15 citations

Journal ArticleDOI
TL;DR: In this paper, three types of flow instabilities, namely, Ledinegg instability, pressure drop oscillations (PDO), and flow excursion with compressible volume (FECV), are considered.

15 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a dimensionless stability limit for pressure drop instability in micro/mini-channels, which is based on the maximum allowable inlet sub-cooling degree.

12 citations

Journal ArticleDOI
TL;DR: In this paper, a novel Nodalized Reduced Order Model (NNROM) is developed to analyze the linear stability phenomena in a heated channel with supercritical water as a coolant.

11 citations

Journal ArticleDOI
TL;DR: In this article, a nonlinear stability analysis of supercritical carbon dioxide (S C − C O 2 ) has been carried out using a reduced order nodalized model for a single inclined heated channel.

11 citations