Dr. Ayelet Goldstein

Dr. Ayelet Goldstein

Dr. Ayelet Goldstein

Department: Mechanical Engineering

Education :

Ph.D.2012, Department of Fluid Mechanics and Heat Transfer. Tel Aviv University, Tel-Aviv, Israel.

M.Sc.2003, Department of Fluid Mechanics and Heat Transfer (the Environmental Engineering Program). Tel Aviv University, Tel-Aviv, Israel.

M.Sc.2000, Department of Solid Mechanics, Material and Systems, Faculty of Engineering. Tel Aviv University, Tel-Aviv, Israel.

B.Sc.1996, Tel Aviv University, Tel-Aviv, Israel.

Files

Filename
Date
Type
Ayelet_Goldstein_CV
20/05/2019

Refereed Papers

Published

  1. Ullmann, M Zamir, A. Goldstein and N. Brauner, ”Closure Relations for the Shear Stresses in Two-Fluid Models for Laminar Stratified Flow”, Int. J. Multiphase Flow, 30(7-8) 877-900, 2004.
  2. Ullmann, A.,  Goldstein A., Brauner, N., ” Gas-Liquid and Liquid-Liquid Stratified Flows Analytical and Mechanistic Models” The Szewalsk Institute of Fluid-Flow Machinery, Polish Academy of sciences. Transactions of the Institute of Fluid-Flow Machinery 117, 59-79, 2005
  3. Goldstein A., Brauner, N., Ullmann, A., ” Characteristics of Stratified Laminar Flows in Inclined Pipes”, Int. J. Multiphase Flow, V7, 267-287, 2015.

Conference Proceedings and Abstracts

Published

  1. Goldstein, A., Ullmann, A., Brauner, N.,  ” Gas-Liquid and Liquid-Liquid Stratified Flows: Analytical and Mechanistic Models” Proc. of the 4th Int. conf. on Transport Phenomena and Multiphase Systems (Ed. J. Mikielewicz , D. Butrymowicz, M. Trela and T. Cieslinski), HEAT2005, Gdansk, Poland, June 26-30, 2005.
  2. Goldstein, A., Ullmann, A., Brauner, N.,  ” Laminar Two Phase   Separated Flows: Analytical Solutions”, Proc. of the 13th International Heat Transfer Conf., paper No. MTH10, Sydney Australia, 13-18 August, 2006
  3. Goldstein, A., Ullmann, A., Brauner, N., “Wall and Interfacial Shear Stresses in Separated Laminar Flows”, Proc. of the 5th European-Japanese Two-Phase flow group meeting, Spoleto, Italy, 20-25 September 2009.
  4. Goldstein, A., Ullmann, A., Brauner, N., Characteristics of Separated Laminar Flows in     Inclined Pipes, Proc. of the 7th international conference of multiphase flow ICMF, Tampa FL USA, May 30 June 4, 2010.

Other Publications

Guideline of the scientific work
Exact solutions for separated two-phase flow are useful as benchmark for numerical codes and for testing closure relations for simplified 1D Two-Fluid (TF) models. Recently we obtained a complete set of exact solutions for laminar flows in inclined pipes. These include all possible configurations of stratified flows (STF) with concave and convex interfaces, and core-annular flows (CAF) with various core eccentricities. The exact solutions are used to analyze the local and averaged wall and interfacial shear stresses for these various flow geometries. A closed-form analytical expression for the average interfacial shear stress was obtained for all cases of STF. The limiting behavior of the local shear stresses at the triple-point, where the interface meets the pipe wall, is determined by residue calculus. It is shown that the shear stresses profiles at the vicinity of the triple points are determined by the fluids viscosity ratio and the contact angle. The usefulness of the exact solutions for testing closure for approximate TF models is discussed. The future plane is to improve the prediction of stability boundaries of various separated flow configurations in the pipe geometry via two fluid models

Articles to be Submitted

  1. Goldstein A., Brauner, N., Ullmann, A.,  “Analytical solution of Laminar Two Phase Core Annular Flow”, 2015.
  2. Goldstein A., Brauner, N., Ullmann, A.,  “Analytical solution of the Interface Shear Stresses in TP Laminar Two Phase Stratified and Fully Eccentric core Flow”, 2015.

Teaching Experience

2013-present

‘Introduction to Control Systems’, Introduction Course (Mandatory).

2013-2014

‘Advanced Control Systems’, Lecture.
Laboratory of Advanced Control Systems’, Laboratory Supervisor.

2014-present

‘Fluid-Mechanics 1’, Introduction Course (Mandatory).

2014-2015

‘Micro Electro-Mechanical Systems (MEMS)’, Introduction Course (Mandatory).

2015

‘Fluid-Mechanics 2’ , Lecture.
‘Laboratory of Micro Electro-Mechanical Systems (MEMS)’, Laboratory Supervisor.

2015-present

‘Introduction to Robotics’, Lecture.
‘Thermodynamics 1’, Lecture.

Academic and Professional Awards and Grants

Awarded the ‘Rieger’ Scholarship for Environmental Research.

Professional Activities

May 2005
Proc. of the 30th Israeli Conference on Mechanical Engineering, Israel, Multiphase Flow, Presenter.
June 2005
Proc. of the 4th Int. conf. on Transport Phenomena and Multiphase Systems, Gdansk, Poland, Multiphase Flow, Co-Author.
August 2006
Proc. of the 13th International Heat Transfer Conf, Sydney Australia, Multiphase Flow, Presenter.
June 2009
47th European Two-Phase Flow Group Meeting, Bled Slovenia, Multiphase Flow, Co-Author.
September 2009
Proc. of the 5th European-Japanese Two-Phase flow group meeting, Spoleto, Italy, Multiphase Flow, Co-Author.
June 2010
Proc. of the 7th international conference of multiphase flow ICMF, Tampa FL USA, Multiphase Flow, Co-Author.
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