Quality assurance of 3D prints: The development of a low cost test & Investigating the influence of temperature and humidity on print quality

Analysis of Thermal Contact Conductance: Experimental Campaign combined with Surfaces Topology study and Contact Modelling

Prediction of heat transfer phenomena and resulting temperature distributions is crucial among many appliances in the industry sector. In a vacuum, the dominant mode of heat transfer is conduction. The resulting temperature drop at the body’s interface is dependent on a parameter known as Thermal Contact Conductance (TCC) or, alternatively,...

Development of a semi-empirical thermal conduction estimation model for dry metal-metal contacts

This thesis aims to investigate the effects of contact pressure and type of deformations on the thermal contact conductance(h’) for dry metal-metal contacts. Also, an attempt is made to develope a thermal contact conductance estimation model for the same. The materials used in this thesis are metals (aluminium and tin). Several experiments are...

Design of a Heat Exchanger with Thermal Storage using PCM

Energy efficiency is a key goal for the Quooker system. To further increase the energy efficiency of the Quooker system, this study investigates a possible heat integration system where the waste heat from the refrigeration cycle for chilled drinking water is implemented to preheat water before entering the boiling water reservoir.<br/>Due to...

Boiling Heat Transfer with Nanofluids: An Experimental Study

Recent advancements in the field of nanotechnology have proven to offer viable alternatives for energy production, transport, and storage. As far as thermal energy is concerned, nanofluids have emerged as a novel method to enhance heat transfer. Indeed, nanofluids exhibit superior thermal capabilities, which may be able to meet the requirement...

The application of hybrid Computational Fluid Dynamics to optimize the air curtain of a refrigerated display cabinet

Conventionally, the geometry of the Fri-Jado open vertical refrigerated display cabinet design is optimized by drawing and producing the new components and testing the new configuration in a climate chamber, which is known to be an iterative process that consumes a large amount of time. To speed up the optimization process, the application of...

Heatpipes for geothermal heat extraction: A study on film heat transfer in heatpipes

Large quantities of heat stored in geothermal aquifers can be of interest to satisfy above-ground heating demands. With the use of heatpipes, placed into the aquifers, heat may be passively extracted. Vertical two-phase thermosiphons are considered in this study. As a result of a local increase in the saturation temperature in liquid pools, heat...

Experimental investigation on the effect of dimple-protrusion surfaces in a counter flow heat exchanger

Flat plate heat exchangers are widely used in industrial and domestic applications. Industrial plate type heat exchangers generally operate in the turbulent flow regime. Although, increase in flow speeds leads to higher transport of heat, it also causes a rise in the pressure loss which is undesirable. Therefore, to combat the problem of high...

Design and characterization of test facility for large angle diffusers

In industry, fired heaters are used to heat process fluids and to generate steam. The efficiency of these devices is increased with air preheating. Gnerally, the flow through the air preheaters is driven by a centrifugal fan, via forced draft. Through a widening transition duct (large angle diffuser), air flows from the fan towards the air...

A geothermal heatpipe prototype

Heatpipes are promising devices for geothermal energy extraction owing to their<br/>effectiveness to transport heat. The goal of this research is to validate an analytical heatpipe model with experiments and to investigate the difficulties in designing and constructing geothermal heatpipes. There is a lack of literature and research concerning...

Evaporative Two-Phase Micro-Flow Modelling

As smaller satellites hold many advantages over their larger counterparts, such as reduced production, testing and launch costs, the cubesat standard of very small satellites has become increasingly popular over the last decade. For these cubesats (1 to 3 kg) the race for an adequate yet simple propulsion system is on, as traditional exothermic...

Defining ventilation boundary conditions for a greenhouse climate model

Presently 10% of natural gas supplied to the Netherlands is used to maintain a stable climate and continuous electricity within horticultural greenhouses. As a result, technologies that reduce this energy consumption are in high demand. Theoretical models of heat flows in greenhouses can be used as a tool to increase the efficiency of these...

Breakup of polystyrene particles in turbulent Taylor-Couette flow: Vallidation of a DNS model for asphaltene agglomeration

The study of polystyrene particles in Talor-Couette flow for the vallidation of a DNS code for asphaltene agglomeration

Design study for the Measurement Section & Diffuser optimisation for the TU Delft cavitation tunnel

A too small optical accessible area of the old Measurement Section of the Cavitation tunnel made monitoring the upcoming experiments, with for instance high speed cameras, impossible. This was its main imperfection. A proper amount of optical accessible area needed lead too this conversion. The new Measurement Section designed has an optical...

Transition to turbulence in Taylor Couette flow

The most recent studies of intermittent state in linearly stable shear flows, like pipe, Plane Couette and Taylor Couette flow, have shown that turbulent structures, created by finite-amplitude perturbation, have an exponential distribution of the lifetimes. Here we experimentally examine the lifetime of turbulent spot in Taylor Couette flow ...