Abstract
Improving the performance of pool boiling with critical heat flux of pool boiling and enhancing the coefficient of heat transfer through surface modification technique have gained a lot of attention. These surface modifications can be done at different scales using various techniques. However, along with the performance improvement, the durability and stability of the surface modification are very crucial. Laser machining is an attractive option in this aspect and is gaining a lot of attention. In the present experimentation research work, pool boiling attributed performance of copper-grooved surfaces obtained through picosecond laser machining method is investigated. The performance of the modified surfaces was compared with the plain surface serving as reference. In this, three square grooved patterns with the same pitch (100 μm) and width (100 μm) but different depths (30, 70, and 100 μm) were investigated. Different depths were obtained by varying the scanning speed of the laser machine. In addition to the microchannel effect, the grain structuring during the laser machining process creates additional nucleation sites which has proven its effectiveness in improving the pool boiling performance. In all aspects, the pool boiling performance of the grooved laser-textured surface has showed increased surface characterisation as compared with the surface of copper.
Highlights
Pool boiling is a complex methodology associated with heat transfer in which the boiling surface is immersed and exposed to the pool of saturated liquid and the transfer of heat occurs on the heating element surface
The latent heat of vaporisation is the reason for the observation of high heat transfer coefficient that occurred in the boiling process
Laser-textured surfaces enhance the value of heat transfer coefficient in comparison to the results shown for bare copper surface
Summary
Pool boiling is a complex methodology associated with heat transfer in which the boiling surface is immersed and exposed to the pool of saturated liquid and the transfer of heat occurs on the heating element surface. The latent heat of vaporisation is the reason for the observation of high heat transfer coefficient that occurred in the boiling process. Nucleate boiling is a highly efficient process for removal of large quantities of heat from heated surface with minimal variation in surface temperature [2]. Notable applications of this process are two-phase heat exchangers and evaporators, boilers and steam generators, electronics cooling, nuclear fuel reactors, etc. The most important pool boiling heat transfer process techniques include heat transfer coefficient (HTC), superheat boiling incipience temperature, and the critical heat flux (CHF)
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