Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
The natural air convective heat transfers of pin fin’s surfaces (tfluid=29°C)
| Surface’s temperature (°C) | Vertical pin (W/m2.K) | Heat sink base (W/m2.K) | Hot slot surface facing down (W/m2.K) | Hot slot surface facing up (W/m2.K) | Vertical hot slot surface (W/m2.K) |
|---|---|---|---|---|---|
| 80 | 8.025 | 6.4 | - | - | - |
| 75 | 7.82 | 6.25 | 6.1 | 13 | 11.69 |
| 70 | 7.598 | 6.08 | 5.93 | 13.28 | 11.36 |
| 65 | 7.355 | 5.88 | 5.74 | 12.85 | 10.99 |
| 60 | 7.08 | 5.67 | 5.53 | 12.38 | 10.59 |
| 55 | 6.78 | 5.426 | 5.29 | 11.85 | 10.13 |
| 50 | 6.428 | 5.144 | 5.02 | 11.23 | 9.61 |
Studies on Slotted heat sink in different regions
| References | Research | Power | Material | Results |
|---|---|---|---|---|
| Unni and Sreedhar Babu (2021) [18] | Compared 3 kinds of heatsink: fin with no perforation, 8 perforations, 10 perforations | 8W, 12W, 45W | Aluminum | The increase of number of hole on heat sink will improve the heat transfer of heatsink. |
| Kumar, et al. (2018) [19] | Compared the one, three and four perforated pin finned heatsinks with no perforation fin using CFD simulation. | 72W | Aluminum, Copper | Four holes finned heatsink is the best. |
| Awasarmol and Pise (2015) [10] | Compared heatsink with 4mm to 12mm diameter hole, inclination from 0-90° with no hole heatsink. | 15 to 35W | Aluminum | Fins with a perforation diameter of 12 mm and an angle of inclination of 45° is the best and save up 30% of material |
| Venkitaraj and Siddikh (2016) [20] | Compared different kinds of perforation heatsink with various diameters such as circular, square, elliptical and triangular were set up with the no hole one. | 15 to 30W | Aluminum | Optimal choice: -12 mm diameter hole finned heatsink. |
| Prasad, et al. (2016) [21] | Investigated the impact of number of hole to performance of heatsink | 24V to 60V | Aluminum | Raising the number of holes increases heat transfer due to more air coming in. |
| Current study | Compared Slotted finned and non-slotted finned heatsink | 10W, 12W, 14W | Aluminum | Slotted finned heatsink is better than that of non-slotted finned heatsink and reduce 16% of mass. |
The natural air convective transfers of various chip power heat
| Power chip | Square pin fin heat sink | Slotted square pin fin heat sink | ||||
|---|---|---|---|---|---|---|
| 10W | Parts | h (W/m2K) | Note | Parts | h (W/m2K) | Note |
| Vertical fin | 7.34 | The average value corresponding to 70°C, 65°C, 60°C | Vertical fin | 6.76 | The average value corresponding to 60°C, 55°C, 50°C. | |
| Horizontal base | 5.879 | Horizontal base | 5.414 | |||
| Hot slot surface facing down | 5.28 | |||||
| Hot slot surface facing up | 11.8 | |||||
| Vertical hot slot surface | 10.11 | |||||
| 12W | Vertical fin | 7.59 | The average value corresponding to 75°C, 70°C, 65°C | Vertical fin | 7.34 | The average value corresponding to 70°C, 65°C, 60°C |
| Horizontal base | 6.1 | Horizontal base | 5.879 | |||
| Hot slot surface facing down | 5.739 | |||||
| Hot slot surface facing up | 12.84 | |||||
| Vertical hot slot surface | 10.98 | |||||
| 14W | Vertical fin | 7.814 | The average value corresponding to 80°C, 75°C, 70°C | Vertical fin | 7.59 | The average value Corresponding to 75°C, 70°C, 65°C |
| Horizontal base | 6.254 | Horizontal base | 6.1 | |||
| Hot slot surface facing down | 5.93 | |||||
| Hot slot surface facing up | 13.26 | |||||
| Vertical hot slot surface | 11.35 | |||||
Heat transfer area, volume and the weight of heat sink
| Heat sink | Surface area (cm2) | Volume (cm3) | Weight (g) | The increase in area (%) | The reduction of weight (%) |
|---|---|---|---|---|---|
| Square pin fin heat sink | 400 | 85 | 230 | 0 | 0 |
| Slotted square pin fin heat sink | 472 | 71.5 | 193.05 | 18 | 16 |