Thermal Management of Heat sink using Passive Technique

Heat sink using Passive Technique

1. Project Presentation

2. Introduction Background Modern electronic devices generate a lot of heat due to high power densities. Traditional air cooling methods are no longer sufficient. Microchannel heat sinks (MCHS) are emerging as a powerful solution for effective heat dissipation in these devices.

3. Objective This study aims to evaluate the thermal and hydraulic performance of a double-layer tapered microchannel heat sink (DL-MCHS) when using a nanofluid (Al2O3–H2O) as the coolant. The performance of the nanofluid is compared against conventional water cooling.

4. Literature Review Tukerman and Pease pioneered MCHS technology, demonstrating its ability to manage heat effectively with water. Subsequent studies have enhanced MCHS designs, such as incorporating double layers for improved cooling. The introduction of nanofluids, like Al2O3–H2O, has shown promise in enhancing cooling efficiency due to better thermal properties. 1 2 3

5. Methodology Computational Model; A 3D solid-fluid conjugate model was used for the study. Assumptions included steady-state conditions, incompressible flow, and negligible effects from radiation and gravity. Geometric Configuration; The DL-MCHS design features two layers of microchannels, separated by a solid rib, with tapered channels to improve heat transfer.

6. Coolants: The study compared two coolants: water and a nanofluid made by dispersing Al2O3 nanoparticles in water.

7. Numerical Model Description Governing Equations: The study used equations governing mass continuity, momentum (fluid flow), and energy for both the fluid and solid regions. Properties: The thermal and physical properties of the nanofluid were considered temperature-dependent for more accurate simulation results.

8. Thermal Performance Heat Transfer Coefficient: The heat transfer coefficient was found to be higher in the tapered DL-MCHS compared to straight channels. The nanofluid (Al2O3–H2O) outperformed water in terms of enhancing the heat transfer rate. Temperature Distribution: The nanofluid resulted in a more uniform temperature distribution along the microchannel, reducing hotspots.

9. Hydraulic Performance Pressure Drop: The pressure drop was higher in the tapered channels compared to straight ones. While the nanofluid improved thermal performance, it also led to increased pressure drop, which needs to be managed for practical applications. Flow Characteristics: The study observed different flow patterns and velocity profiles, which were influenced by the tapering of the channels.

10. Conclusion Summary: The study showed that the tapered DL-MCHS with Al2O3–H2O nanofluid significantly improves thermal performance However, the increase in pressure drop must be addressed in practical applications.

11. Future Work: Future research should focus on further optimizing the geometry and exploring different nanofluids. Experimental validation of these computational results is also recommended.

12. Thank You Presented by AMIT,MANISH,SIDDHARTH