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Publications (18)
This article presents an experimental and numerical study on the heat transfer behavior in the channel flow past a confined rectangular cylinder at (relatively) low Reynolds number. The work is motivated by a previous article by the authors (Meis et al. (2010)) that illustrated through a 2D numerical model that a significant heat transfer improveme...
An experimental study based on Particle Image Velocimetry (PIV) is presented with the objective of studying the flow regimes that appear in the flow past a confined prism undergoing self-sustained oscillations at low Reynolds numbers (Re). The square-section prism, placed inside a 3D square cross-section vertical channel with a confinement ratio of...
This article describes an experimental study on the influence that tip clearance exerts on heat transfer and pressure drop when a power law non-Newtonian fluid (hydroxyethyl cellulose at 0.1, 0.25, and 0.5% mass fractions) passes through a microchannel-based heat sink. This problem is of practical interest for engineering systems in which both heat...
The experimental work presented in this article deals with the study of low-frequency high-amplitude pressure wave attenuation in a cavity when boiling takes place on the inside. The working fluid was HFE7100. Regarding the flow regime, the study considered two different situations: pool boiling and flow boiling in the low to moderate Reynolds numb...
An experimental PIV study is presented that addresses the confined 3D laminar flow behaviour past a square prism. The Reynolds number (Re), based on prism cross-section height varies between 100 and 256. The channel aspect ratio is 1/1 and the blockage ratio is 1/2.5. This geometry is representative of a passive method to enhance mixing in otherwis...
The goal of this research was to improve the fuel flexibility of a 4.97 cc Wankel rotary engine for use in various military, disaster relief and consumer applications. The design, construction and testing of a fuel flexible engine dynamometer and fuel delivery system is presented along with experimental data that demonstrates the fuel-flexible capa...
An experimental and theoretical/numerical study is presented on the behaviour of a vertically placed vapour chamber based heat spreader (190 mm × 140 mm × 15 mm) intended for avionics applications. The experiments were performed with the heat spreader inserted in a mock-up avionics box. The volumetric flow of cooling air was in the range of 5–25 m3...
This article presents a method that improves the real time performance of some optimisation algorithms used in engineering control units. The motivation behind the improvement is the fact that when these algorithms are based on a computationally expensive set of model equations, real time optimisation is seldom possible. This is, for example, the c...
This article presents an experimental study on the optimisation of micro-heat sink configurations when both thermal effects and pressure drop are accounted for. The interest of the latter is that the practical engineering viability of some of these systems also depends on the required pumping power. The working fluid was water and, according to typ...
This paper deals with the study of 2-D, laminar, pulsating flow inside a heated rectangular cavity with different aspect ratios. The cooling liquid (water with temperature dependent viscosity and thermal conductivity) comes and leaves the cavity via inlet and outlet ports. The flow topology is characterised by the large recirculation regions that e...
This study is motivated by the need to devise means to enhance heat transfer in configurations, like the back step, that appear in certain types of MEMS that involve fluid flow and that are not very efficient from the thermal transfer point of view. In particular, the work described in this paper studies the effect that a prescribed flow pulsation...
The aim of this study is to test numerically the influence that incompressible flow pulsation has on heat transfer in configurations,
such as the backward facing step, that appear in micro-electro mechanical systems (MEMS) and that are not very efficient from
the thermal point of view. Two control parameters have been used to increase heat transfer...
In Diesel engines equipped with jerk injection pumps there appear many effects derived from fuel compressibility and the short duration of injection. As a result of them, cavitation, secondary injection, dribble and other hazardous phenomena may occur. With the objective of studying these processes, a simulation model for an indirect Diesel injecti...
El presente trabajo pretende seguir una doble vertiente. En primer lugar, se realizarán una serie de desarrollos dentro del campo de la Simulación Numérica de Procesos Físicos. La inmensa mayoría de fenómenos que ocurren en la naturaleza son susceptibles de ser modelizados mediante un determinado sistema de ecuaciones matemáticas. Con el planteamie...