A5054138334- Heat Transfer and Boiling Studies
- Heat Transfer and Optimization
- Heat Transfer Mechanisms
- Refrigeration and Air Conditioning Technologies
- Solar Thermal and Photovoltaic Systems
- Fluid Dynamics and Thin Films
- Advanced Photocatalysis Techniques
- Advanced Thermoelectric Materials and Devices
- Machine Learning in Materials Science
Technical University of Denmark
2019-2023
Abstract The energy transition is one of the main challenges our society and therefore a major driver for scientific community. To ensure smart to sustainable future scenario different technologies such as harvesting using solar cells or windmills chemical storage in batteries, super-capacitors hydrogen have be developed ultimately deployed. New fabrication approaches based on additive manufacturing digitalization industrial processes increase potential achieve highly efficient required...
Flow boiling of refrigerants in narrow channels has a great potential to cope with future challenges the thermal management high heat flux electronics. This study investigated flow transfer R1234yf, R1234ze(E), and R134a multi-microchannels as applied was varied from incipience critical flux. A parametric analysis on two-phase local coefficients conducted for channel mass fluxes 415 kg/m2s 1153 saturation temperatures 30.5 ∘C 40.5 ∘C. The test section comprised 17 inlet restrictions. were...
This experimental study investigated narrow and high aspect ratio multi-microchannels that were micro-machined in copper with thin separating walls during saturated flow boiling of refrigerants. The hypothesis was these channels could increase the footprint critical heat flux support future development thermal management systems for power electronics other electronic packages. measured as 678.5 W/cm2, which is twice investigations literature concerning Two test samples fabricated a area (10...
This study aims to characterize experimentally the heat transfer in micro-milled multi-microchannels copper sinks operating with flow boiling, attempt contribute development of novel and high flux thermal management systems for power electronics. The working fluid was R-134a investigation conducted a nominal outlet saturation temperature 30 ∘C. microchannels were 1 cm long covered square footprint area cm2. Boiling curves starting at low vapor quality average coefficients obtained channel...
Thermal management of electronics is continuously challenged by increasing heat fluxes to be dissipated at minimum power consumption. This study investigated the pressure drops and transfer coefficient two low-GWP refrigerants, R1234yf R1234ze(E), during flow boiling high fluxes. The test geometry comprised 25 parallel microchannels, 200 μm wide, 1200 deep 1 cm long, nominally. Inlet orifices were used stabilize flow. A parametric analysis involving mass flux was conducted for nominal...
Compared to the single-phase counterpart, thermal management by evaporative flows offer several advantages, such as higher heat flux, reduced temperature gradients and lower pumping power. This work presents new experimental data on flow boiling of R134a in an array parallel microchannels. Heat transfer coefficient evaluation visualization were performed copper microchannels, with aspect ratio 4. The nominal width channels was 300 μm, a corresponding height 1200 μm. presented refer outlet...