Tunis University

About: Tunis University is a education organization based out in Tunis, Tunisia. It is known for research contribution in the topics: Population & Thin film. The organization has 11745 authors who have published 15400 publications receiving 154900 citations. The organization is also known as: University of Tunis & UT.

A CFD analysis of the flow structure inside a steam ejector to identify the suitable experimental operating conditions for a solar-driven refrigeration system

Abstract: This paper presents a numerical study of a steam ejector using CFD with the objective of identifying suitable experimental conditions that allows for a reliable ejector cycle operation. The flow structure and the mixing process inside the ejector were assessed for a range of operating conditions typical for a solar driven air conditioning system. The effect of varying the condenser pressure was studied. It was found that for relatively low condenser pressures (

Mathematical modeling for turning on AISI 420 stainless steel using surface response methodology

Abstract: In this study, an attempt has been made to statistically model the relationship between cutting parameters (speed, feed rate and depth of cut), cutting force components (Fx, Fy and Fz) and workpiec...

Controllability of Two Coupled Wave Equations on a Compact Manifold

Abstract: We consider the exact controllability problem on a compact manifold Ω for two coupled wave equations, with a control function acting on one of them only. Action on the second wave equation is obtained through a coupling term. First, when the two waves propagate with the same speed, we introduce the time \({T_{\omega \rightarrow \mathcal{O} \rightarrow \omega}}\) for which all geodesics traveling in Ω go through the control region ω, then through the coupling region \({\mathcal{O}}\), and finally come back in ω. We prove that the system is controllable if and only if both ω and \({\mathcal{O}}\) satisfy the Geometric Control Condition and the control time is larger than \({T_{\omega \rightarrow \mathcal{O} \rightarrow \omega}}\). Second, we prove that the associated HUM control operator is a pseudodifferential operator and we exhibit its principal symbol. Finally, if the two waves propagate with different speeds, we give sharp sufficient controllability conditions on the functional spaces, the geometry of the sets ω and \({\mathcal{O}}\), and the minimal time.