Experimental investigation on heat transfer enhancement of mist/air impingement jet

Turning of steels under various cooling and lubrication techniques: a review of literature, sustainability aspects, and future scope

“…The high pressure and high speed of cutting fluid jet penetrates through the tool-workpiece-chip interfaces and eliminate the seizure conditions and eventually the boiling film blanket at cutting zone [80,108]. The cooling performance improved due the more heat transfer as result of higher conductive and convective heat transfer coefficient [110,111], while the lubricating performance improved due to the development of hydraulic wedge at chip-tool interface as well as to alteration of chip flow condition and effective flushing of produced chips [112,113]. But due to different issues associated with high pressure application strategy, more focus has been shifted for minimal usage of cutting fluids [114].…”

Experimental Investigation on Mist Flow and Heat Transfer in a Uniformly Heated Vertical Cylinder

“…In relation (7), Dh is the hydraulic diameter of the test cylinder determined as relation (8), and k is the thermal conductivity of the passing flow.…”

“…To overcome this problem, efforts have been made by many researchers to find more efficient coolants that ultimately enhance the cooling performance. Using air/water mist twophase flow as a coolant is one of the efficient methods of cooling enhancement [1][2][3][4], which provides a greatly enhance in heat and mass transfer between heated wall and main flow due to the following features: (a) dissipates a huge amount of energy in the form of latent heat during water mist evaporation process, (b) decreases the bulk temperature of coolant after mixing process, (c) increases specific heat, (d) increases temperature gradient near the heated wall, (e) increases main flow turbulence caused by air/water mist interactions and water mist dynamics, and (f) disturbs the thermal boundary layer near the heated wall [5][6][7][8][9][10][11].With the reasons mentioned above, the air/water mist two-phase flow can provide a highly efficient cooling performance and achieve heat transfer rates even higher than those occurring in single-phase air cooling. Although the air cooling method has been used, studied and discussed extensively in several industrial applications, it's only in the last few years ago that more and more investigations have focused on analyzing the air/water mist two-phase flow owing to its complicated nature and difficulty of creating a uniform air/water mist flow.…”

Conjugate heat transfer analysis of leading edge and downstream mist–air film cooling on turbine vane

“…They found that the mist cooling enhancement was in the order of flat surface > pressure surface > suction surface > leading edge. Tan et al [10,11] investigated the heat transfer performance of a mist/air jet impingement on a constant-heat flux surface, the results show that the addition of dilute water droplets to air flow results in significant heat transfer enhancement. Once the mist/air ratio is increased to a certain value, the increase of heat transfer with the mist/air ratio becomes slow.…”