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The pin-fin is one of the main technologies in enhancing heat transfer. The accelerated flow and vortex structures are produced, which can disrupt the development of the flow boundary layer. The configuration of the pin-fin is obvious for heat transfer and flow characteristics, including its shape, size, and arrangement in the cooling channel. This work provides a detailed introduction to the application of pin-fins in enhancing heat transfer and reducing flow resistance, including the conventional shapes, improved shapes based on circular pin-fins and irregular shapes. At the same time, the influence of the diameter, height and density of pin-fins on heat transfer and flow performance is studied, and the influence mechanism is analyzed from the perspective of boundary layers. In addition, some applications that combine pin-fins with other cooling methods to further improve performance are analyzed. In terms of the optimization technology, the structure optimization for pin-fin shape and the layout optimization for pin-fin array are summarized. Therefore, this review provides a wide range of literature for the design of internal cooling channel pin-fins. [ABSTRACT FROM AUTHOR]

This research presents a surrogate model and computational fluid dynamic analysis-based multi-objective optimization approach for microchannel heat sinks. The Non-dominated Sorting Genetic Algorithm is suggested to obtain the optimal solution set, and the Kriging model is employed to lower the simulation's computational cost. The physical model consists of a coolant chamber, a mainstream chamber, and a solid board equipped with staggered Zigzag cooling channels. Five design variables are examined in relation to the geometric characteristics of the microchannel heat sinks: the length of inlet of the cooling channels, the width of the cooling channels, the length of the "zigzag", the height of the cooling channels, and the periodic spanwise width. The optimal geometry is established by choosing the averaged cooling effectiveness and coolant mass flow rate which enters the mainstream chamber through the microchannel heat sinks as separate objectives. From the Pareto front, the optimal microchannel heat sinks structures are obtained. Three optimized results are studied, including the maximum cooling effectiveness, minimum coolant mass flow rate, and a compromise between the both objectives; a reference case using the median is compared as well. Numerical assessments corresponding to the four cases are performed, and the flow and cooling performance are compared. Furthermore, an analysis is conducted on the mechanisms that impact the ideal geometric parameters for cooling performance. [ABSTRACT FROM AUTHOR]

This paper proposes a novel lamilloy cooling structure equipped with internal minichannels used in a combustor flame cylinder. The overall flow and heat transfer characteristics of three different internal minichannel configurations (parallel-flow, counter-flow, and staggered arrangements. PF, CF, and SF for short) are analyzed and compared. From the analysis of the heat transfer characteristic, it is found that the CF structure possesses the best cooling effect and temperature uniformity. The average cooling effectiveness (ηave) of the CF structure increased by 20.6% and 20.4%, and the average temperature gradient ( (d T / d X) a v e ) decreased by 76.9% and 32.8%, compared with the SF structure and PF structure, respectively. From the analysis of flow characteristics, the coolant ejected from the minichannel one region of the SF structure completely blocks the direct contact between the mainstream and the lamilloy, while transferring more from the mainstream to the minichannel two region. Different from the SF structure, film cooling at the two outlet of the CF structure transfers most of the mainstream to the lower position, which further improves the cooling effect of the two internal minichannels. [ABSTRACT FROM AUTHOR]

• A new lamilloy structure equipped with staggered internal minichannels is put forward to achieve an effective cooling. • The lamilloy structure consists of three cooling effects: the impingement cooling, forced convective heat transfer and the film cooling. • The effect on the cooling performance of mass flow ratio and temperature ratio are investigated and compared. The efficiency improvement of the advanced high-power heavy-duty gas turbine will certainly make the design of the combustor develop in the direction of high temperature rise and high heat capacity. Lamilloy cooling is considered the promising cooling structure that can replace the currently commonly used film cooling. This paper proposes a novel long-channel lamilloy cooling structure equipped with internal channels and pin-fins used in combustor flame cylinders, and the cooling and flow characteristics of the proposed structure are studied by combining experiment and simulation. An experimental system is established to explore the cooling characteristic of the proposed structure, and the effect on the cooling characteristic of mass flux ratio (1.07 %∼2.35 %) and temperature ratio (0.5∼0.7) are studied and compared. The cooling effectiveness is found to be increased by 39.62 % when the mass flux ratio increases from 1.07 % to 2.35 % while keeping the temperature ratio at 0.5, and increased by 28.14 % when the temperature ratio increases from 0.5 to 0.7 while keeping the mass flux ratio at 1.07 %. The numerical results show that when T * =0.6, m f * increases from 1.07 % to 2.35 %, the η a increases from 0.469 to 0.628, correspondingly increased by 33.9 %. When m f * =1.93 %, T * increases from 0.5 to 0.7, the η a increases from 0.567 to 0.602, correspondingly increased by 6.27 %, the corresponding increment is weak. The flow field structure shows that strong vortex structures are formed around the pin-fins, and the secondary flow is induced when the coolant flows through the region of the pin-fins, which will enhance the local heat transfer effect. Moreover, the coolant ejecting from the film hole acts as a "baffle", blocking the direct contact between the mainstream and the LLC, playing a similar role to the film cooling. The long-channel lamilloy cooling structure proposed is an effective measure to replace the film cooling, and the research herein provides some reference for designing the combustor flame cylinder cooling structure. [ABSTRACT FROM AUTHOR]