Design of a flow boiling loop

Institut

Lehrstuhl für Thermodynamik (TUM-ED)

Typ

Bachelorarbeit / Semesterarbeit / Masterarbeit /

Inhalt

 

Beschreibung

Introduction

Microscale flow boiling is a promising concept for compact high-performance cooling systems, as it can provide very high heat transfer coefficients within small channel geometries. However, reliable prediction of heat transfer and critical heat flux in microchannels remains an active field of research. Existing correlations often show large deviations outside their original experimental range, mainly because the local interaction between bubble dynamics, flow pattern, surface temperature and microlayer evaporation is not yet fully understood. [1][2][3] 

 

Goal

The proposed thesis aims to enable future experimental investigation of microscale flow boiling by developing a flow boiling loop. The main objective is to design the overall system concept, define the relevant operating requirements, and select suitable components to translate the theoretical concept into a realizable experimental setup. Figure 1 showcases a schematic overview of an example flow boiling loop.

 

Overview of the work steps

Conceptual design of the boiling cycle regarding: 

• Pump – pressure drop 

• Preheater - required power 

• Condenser 

• Accumulator 

• Degassing concept 

• Overpressure relief 

• Experimental bypass 

Instrumentation and monitoring concept: 

• Temperature sensors 

• Pressure sensors 

• Flow meter 

Choice of equipment based on: 

• Design decisions 

• Costs 

• Quality 

• Controllability 

• Availability

Bonus (depending on progress and interest): 

• Assembly of the loop 

• Programming of control software 

• Programming of data logging

 

Sources 

[1] Sung-Min Kim, Issam Mudawar: “Review of databases and predictive methods for heat transfer in condensing and boiling mini/micro-channel flows” 

[2] Lixin Cheng, Guodong Xia: “Fundamental issues, mechanisms and models of flow boiling heat transfer in microscale channels” 

[3] Gherhardt Ribatski, Leszek Wojtan, John R. Thome: “An analysis of experimental data and prediction methods for two-phase frictional pressure drop and flow boiling heat transfer in micro-scale channels” 

[4] Moritz Till Bruder, „Experimental Study on the Identification of Heat Transfer Characteristics for Subcooled Flow Boiling of Novec 649“. 27. Juni 2019.

Voraussetzungen

• Good knowledge in thermodynamics and fluid dynamics 

• Experience in CAD (preferable CATIA V5) 

• Structured, precise and independent way of working 

• Interest in the design of a future experiment

Möglicher Beginn

sofort

Kontakt

M.Sc. Keno Maierhofer
Raum: 5507.01.727
Tel.: +49 89 289 16238
keno.maierhofertum.de