Master Thesis: Thermal Design

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About this opportunity:

The rapid growth of power-dense electronics has driven the demand for advanced cooling technologies capable of handling extremely high heat fluxes. Vapor chambers have emerged as a promising solution due to their ability to spread heat efficiently through phase-change mechanisms and capillary-driven fluid circulation. A key factor influencing their performance is the wick structure, which governs liquid return, capillary pressure, and thermal resistance. Traditional wick designs often struggle to simultaneously provide high capillary pumping and low flow resistance, especially under ultra-high heat flux conditions. To overcome these limitations, hierarchical wick structures offer a pathway toward enhanced vapor chamber performance by achieving both efficient liquid transport and effective heat spreading.

This thesis project aims to design and optimize a high heat flux vapor chamber equipped with a hierarchical wick structure, with the goal of enhancing thermal performance and reliability. The study will combine literature analysis, modeling, and optimization to explore the interplay between wick architecture, capillary transport, and overall thermal resistance.

What you will do:
- Conducting a comprehensive literature review on vapor chamber technologies, wick designs, and optimization strategies.
- Defining key performance objectives (e.g., maximum heat flux capacity, capillary limit, spreading resistance) and establishing systematic parameter sets for wick geometry and material properties.
- Developing or adapting a computational model to predict heat and mass transport within the vapor chamber, with particular attention to capillary flow and vapor-liquid interactions
- Performing sensitivity and parametric analyses to evaluate the influence of hierarchical wick features (e.g., permeability gradients, thickness variations) on device performance.
- Establishing an optimization framework to identify wick configurations that maximize thermal efficiency while ensuring manufacturability and scalability.

The skills you bring:
- Background in thermodynamics, fluid mechanics, mechanical engineering, energy technology, applied physics, or related fields.
- A solid understanding of heat transfer and phase-change phenomena.
- Prior experience with CFD modeling and numerical methods.
- Strong analytical skills, systematic problem-solving, and the ability to work independently.
- Familiarity with porous media or multiphase flow modeling will be considered an advantage.

Why join Ericsson?

At Ericsson, you'll have an outstanding opportunity. The chance to use your skills and imagination to push the boundaries of what's possible. To build solutions never seen before to some of the world's toughest problems. You'll be challenged, but you won't be alone. You'll be joining a team of diverse innovators, all driven to go beyond the status quo to craft what comes next.

What happens once you apply?

Click Here to find all you need to know about what our typical hiring process looks like.

Encouraging a diverse and inclusive organization is core to our values at Ericsson, that's why we champion it in everything we do. We truly believe that by collaborating with people with different experiences we drive innovation, which is essential for our future growth. We encourage people from all backgrounds to apply and realize their full potential as part of our Ericsson team. Ericsson is proud to be an Equal Opportunity Employer. learn more.

Primary country and city:Sweden (SE) || Stockholm

Req ID:777743