Figure 1.
The square pin fin heat sink (a), the slotted square pin fin heat sink (b) and Orientation of surfaces (c)
Table 1.
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 |
Table 2.
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 |
Table 3.
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 | |||||
Figure 2.
The mesh calculation of the Square pin fin heat sink (a) and the Slotted square fin pin heat sink (b)
Figure 3.
The temperature of the base (a) and the fin (b) of heat sinks
Figure 4.
Temperature distribution of: Square pin fin heat sink with 10W (a), 12W (b), 14W (c); Slotted square pin fin heat sink with 10W (d), 12W (e), 14W (f)
Figure 5.
Heat dissipation of heat sink (a) and The thermal resistance of heat sink to air (b)
Table 4.
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. Circular and elliptical perforations show similar heat transfer traits. Triangular perforations exhibit the lowest heat transfer coefficient. |
| 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. |