Academic literature on the topic 'Latticework cooling'
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Journal articles on the topic "Latticework cooling"
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Acharya, S., F. Zhou, J. Lagrone, G. Mahmood, and R. S. Bunker. "Latticework (Vortex) Cooling Effectiveness: Rotating Channel Experiments." Journal of Turbomachinery 127, no. 3 (March 1, 2004): 471–78. http://dx.doi.org/10.1115/1.1860381.
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The heat transfer and pressure drop characteristics of latticework coolant blade passages have been investigated experimentally under conditions of rotation. Stationary studies with the latticework configuration have shown potential advantages including spatially-uniform streamwise distributions of the heat transfer coefficient, greater blade strength, and enhancement levels comparable to conventional rib turbulators. In the present study, a latticework coolant passage, with orthogonal-ribs, is studied in a rotating heat transfer test-rig for a range of Reynolds numbers (Res), Rotation numbers (Ros), and density ratios. Measurements indicate that for Res⩾20,000, the latticework coolant passage provides very uniform streamwise distributions of the Nusselt number (Nus) with enhancement levels (relative to smooth-channel values) in the range of 2.0–2.5. No significant dependence of Nus on Ros and density ratio is observed except at lower Res values (⩽10,000). Nusselt numbers are highest immediately downstream of a turn indicating that bend-effects play a major role in enhancing heat transfer. Friction factors are relatively insensitive to Ros, and thermal performance factors at higher Res values appear to be comparable to those obtained with conventional rib-turbulators. The present study indicates that latticework cooling geometry can provide comparable heat transfer enhancements and thermal performance factors as conventional rib-turbulators, with potential benefits of streamwise uniformity in the heat transfer coefficients and added blade strength.
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Deng, Hongwu, Kai Wang, Jianqin Zhu, and Wenyan Pan. "Experimental study on heat transfer and flow resistance in improved latticework cooling channels." Journal of Thermal Science 22, no. 3 (May 4, 2013): 250–56. http://dx.doi.org/10.1007/s11630-013-0620-3.
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Luo, Jiahao, Yu Rao, Li Yang, Mingyang Yang, and Hang Su. "Computational analysis of turbulent flow and heat transfer in latticework cooling structures under various flow configurations." International Journal of Thermal Sciences 164 (June 2021): 106912. http://dx.doi.org/10.1016/j.ijthermalsci.2021.106912.
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Du, Wei, Lei Luo, Songtao Wang, Jian Liu, and Bengt Sunden. "Numerical investigation of flow field and heat transfer characteristics in a latticework duct with jet cooling structures." International Journal of Thermal Sciences 158 (December 2020): 106553. http://dx.doi.org/10.1016/j.ijthermalsci.2020.106553.
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Bu, Shi, Lianfeng Yang, Hanghai Qiu, Yigang Luan, and Haiou Sun. "Effect of sidewall slots and pin fins on the performance of latticework cooling channel for turbine blades." Applied Thermal Engineering 117 (May 2017): 275–88. http://dx.doi.org/10.1016/j.applthermaleng.2017.01.110.
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El Semary, Yasmin M., Hany Attalla, and Iman Gawad. "Modern Mashrabiyas with High-tech Daylight Responsive Systems." Academic Research Community publication 1, no. 1 (September 18, 2017): 11. http://dx.doi.org/10.21625/archive.v1i1.113.
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The environmental and social role of closed oriental balconies (Mashrabiyas) remains a significant vernacular aspect of Middle Eastern architecture. However, nowadays this traditional Islamic window element with its characteristic latticework is used to cover entire buildings as an oriental ornament, providing local identity and a sun-shading device for cooling. In fact, designers have reinvented this vernacular Islamic wooden structure into high-tech responsive daylight systems – often on a massive scale and using computer technology – not only to cover tall buildings as an oriental ornament, but also as a major responsive daylight system.It is possible to use the traditional architectural Islamic elements of the Middle East for problem solving design solutions in present-day architecture. The potential for achieving these solutions lies in the effective combination of the design concepts of the traditional elements with new smart materials and technologies. Hence, modern mashrabiyas could be a major responsive daylight system. Contextual information drawn from relevant theory, ethnography and practice is used to form a methodological framework for the modern mashrabiyas with high-tech responsive daylight systems. The main results set boundaries for the viability of computer technology to produce mashrabiyas and promote a sustainable way of reviving their use within Middle Eastern buildings.
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Rao, Yu, and Shusheng Zang. "Flow and Heat Transfer Characteristics in Latticework Cooling Channels With Dimple Vortex Generators." Journal of Turbomachinery 136, no. 2 (October 15, 2013). http://dx.doi.org/10.1115/1.4025197.
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A comparative experimental and numerical study has been conducted on the flow and heat transfer characteristics in a latticework cooling channel with U-shaped subchannels combined with dimple vortex generators over the Reynolds number range of 7700–36,985. The average Nusselt number and friction factor of the latticework channel have been obtained. The comparisons between the experimental and numerical data have shown that the numerical computation model can reasonably well predict the heat transfer and pressure loss in the latticework cooling channels. Additional numerical computations were further performed to investigate the effects of subchannel configurations on the flow and heat transfer in the latticework channel, and three different subchannel configurations were studied, which are the dimpled U subchannel, U subchannel, and rectangular subchannel. The experimental data of the heat transfer and pressure loss of the latticework channel with dimpled U subchannels have also been compared with those of the ribbed channels and pin fin channel from the literature. The present study indicated that the superior heat transfer enhancement capability of the latticework cooling is mainly due to the remarkably increased heat transfer area, turning effects producing strong vortical flow in the subchannels, and the interactions between the flow in the crossing subchannels, as well as the interactions between the flow and the crossing ribs on the opposite side.
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Tariq, Andallib, and Anjana N. Prajapati. "Heat Transfer Characteristics Within the Matrix Cooling Channels." Journal of Turbomachinery 143, no. 5 (April 7, 2021). http://dx.doi.org/10.1115/1.4050113.
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Abstract Matrix or latticework cooling has become a new area of research due to its advantage of providing a structural rigidity to the fragile structures like gas turbine blades, electronic components or circuitries, and compact heat exchangers. In this article, the heat transfer characteristics in matrix cooling channels with different rib angles have been studied using liquid crystal thermography. A total of three matrix models with rib angles 35 deg, 45 deg, and 55 deg having a common subchannel aspect ratio 0.8 have been studied. The results are evaluated in terms of local and average augmentation Nusselt numbers for different regions of the matrix. The augmentation Nusselt number has been found to increase in each region as the angle increases from 35 deg to 45 deg and the same has been found to decrease slightly upon the further increase in angle from 45 deg to 55 deg. The highest percentage increase in augmentation Nusselt number up to 50% has been observed in entry region, whereas the same remained nearly 26–30% in middle and exit regions in streamwise directions, i.e., the effect of the matrix rib angle is more prominent in the entry region. The higher resistance offered by the greater number of ribs for angle 55 deg is believed to be responsible for the decrease in augmentation Nusselt number for Re ≤ 9000.
Dissertations / Theses on the topic "Latticework cooling"
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Maletzke, Fabian. "Investigation Of The Influence Of Geometrical Parameters On Heat Transfer In Matrix Cooling : A Computational Fluid Dynamics Approach." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-177185.
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Modern gas turbine blades and vanes are operated at temperatures above their material’s melting point. Active external and internal cooling are therefore necessary to reach acceptable lifetimes. One possible internal cooling method is called matrix cooling, where a matrix of intersecting cooling air channels is integrated into a blade or vane. To further increase the efficiency of gas turbines, the amount of cooling air must be reduced. Therefore it is necessary that heat transfer inside a cooling matrix is well understood. In the first part of the thesis, a methodology for estimating heat transfer in the flow of matrix cooling channels was established using Computational Fluid Dynamics. Two four-equation RANS turbulence models based on the k-ε turbulence model showed a good correlation with experimental results, while the k-ω SST model underpredicted the heat transfer significantly. For all turbulence models, the heat transfer showed high sensitivity towards changes in the numerical setup. For the k-ω SST turbulence model, the mesh requirements were deemed too computationally expensive and it was excluded from further investigations. As the second part of the thesis, a parameter study was conducted investigating the influence of several geometric parameters on the heat transfer in a cooling matrix. The matrix was simplified as a channel flow interacting with multiple crossing flows. The highest enhancement in heat transfer was seen with changes in taper ratio, aspect ratio and matrix angle. Compared to smooth pipe flow, an increase in heat transfer of up to 60% was observed. Rounded edges of the cooling channels showed a significant influence on the heat transfer as well. In contrast, no influence of the wall thickness on the heat transfer was observed. While no direct validation is possible, the base case and the parameter sweeps show a good correlation with similar cases found in the literature.
Conference papers on the topic "Latticework cooling"
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Su, Sheng, Jian-Jun Liu, Jing-Lun Fu, Jie Hu, and Bai-Tao An. "Numerical Investigation of Fluid Flow and Heat Transfer in a Turbine Blade With Serpentine Passage and Latticework Cooling." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50392.
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This paper describes 3D numerical simulations of a turbine rotor blade with complex internal cooling structure. Conjugate heat transfer method is used to get an accurate blade temperature distribution. The cooling structure consists of a rib roughened serpentine channel near the leading edge, latticework cooling channels in the middle part and slots at the trailing edge. Both the rib roughened channel and the latticework cooling channels can enhance the heat transfer. Furthermore, the latticework cooling channels can enhance the blade strength. Different cooling structures are simulated and analyzed, including changing the configuration of the latticework cooling channels, and whether to apply two holes to the blade tip or not. The effects of different internal cooling configurations are as follows. Firstly, blade temperature distribution is highly disordered: low temperature at the U turning of the serpentine passage, medium temperature at the location of latticework in a relatively uniform distribution, and a few hot spots on the trailing edge. Secondly, tip holes can improve the cooling in serpentine passage by improving fluid flow at the U turning with a negative impact on the cooling of latticework and trailing edge slots. Thirdly, smaller width to height ratio of the sub passage in latticework channels increases coolant flow resistance and leads to an improved latticework cooling with also a negative impact on the cooling of trailing edge slots.
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Rao, Yu, Xiang Zhang, and Shusheng Zang. "Flow and Heat Transfer Characteristics in Latticework Cooling Channels With Dimple Vortex Generators." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95237.
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A comparative numerical study has been conducted on the flow and heat transfer characteristics in the latticework cooling structure with three different subchannel configurations: rectangular subchannels, U shaped subchannels and U shaped subchannels with dimple vortex generators. Experiments have been conducted using the latticework structure with U shaped subchannels with dimples. The comparisons between the experimental and numerical data have shown that the numerical computation model can reasonably well predict the heat transfer and pressure loss in the latticework cooling channels. The computation results showed that the latticework cooling structure has significantly enhanced heat transfer performance, and remarkably increased heat transfer area. Over the Reynolds number range of 7,696–36,985, depending on the geometry of the subchannels the average Nusselt number of the latticework channel is about 1.9–2.3 times that of a smooth channel, but the friction factor is about 6.4–11.1 times that of a smooth channel. The U shaped subchannels with dimples provide the greatest heat transfer enhancement and the most uniform heat transfer both axially and laterally, whose average Nusselt number is about 16.0% higher than the other two subchannels. Compared to the U subchannel, the dimples in the U subchannels work as vortex generators and provide additional heat transfer enhancement, whereas distinctively increase the pressure loss. Compared to the latticework cooling with U subchannels, the latticework cooling with rectangular subchannels shows similar average heat transfer the latticework cooling with rectangular subchannels shows similar average heat transfer and pressure loss performance.
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Acharya, S., Fuguo Zhou, Jonathan Lagrone, Gazi Mahmood, and Ronald S. Bunker. "Latticework (Vortex) Cooling Effectiveness: Part 2 — Rotating Channel Experiments." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53983.
Full textAbstract:
The heat transfer and pressure drop characteristics of latticework coolant blade passages have been investigated experimentally under conditions of rotation. Stationary studies with the latticework configuration have shown potential advantages including spatially-uniform streamwise distributions of the heat transfer coefficient, greater blade strength, and enhancement levels comparable to conventional rib turbulators. In the present study, a latticework coolant passage, with orthogonal-ribs, is studied in a rotating heat transfer test-rig for a range of Reynolds numbers (Res), Rotation numbers (Ros), and density ratios. Measurements indicate that for Res≥20,000, the latticework coolant passage provides very uniform streamwise distributions of the Nusselt number (Nus) with enhancement levels (relative to smooth-channel values) in the range of 2.0 to 2.5. No significant dependence of Nus on Ros and density ratio is observed except at lower Res values (≤10,000). Nusselt numbers are highest immediately downstream of a turn indicating that bend-effects play a major role in enhancing heat transfer. Friction factors are relatively insensitive to Ros, and thermal performance factors at higher Res values appear to be comparable to those obtained with conventional rib-turbulators. The present study indicates that latticework cooling geometry can provide comparable heat transfer enhancements and thermal performance factors as conventional rib-turbulators, with potential benefits of streamwise uniformity in the heat transfer coefficients and added blade strength.
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Xu, Jin, Ruishan Lu, Ke Zhang, Jiang Lei, and Junmei Wu. "An Experimental Study of Impingement Cooling on Latticework in a Wide Channel." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91427.
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Abstract Previous researches on latticework were focused on the convective heat transfer performance on pressure and suction sides of a blade model. Besides, it has an effect on leading edge by impingement. Thus, the present study provides heat transfer enhancement and pressure loss of jet impingement of a latticework on side wall in a wide channel (AR = 4). Two latticework configurations with impingement effects are employed in this study. Three kinds of sub-channel models are used in this experiment, which is according to different cooling designs. The angle of the rib is 45° and the numbers of subchannel are 4, 6 and 8, respectively. Reynolds number range is from 10000 to 30000 with an increment of 10000. The wall temperature is obtained by using wide band liquid crystal technique, and then the heat transfer coefficients on the target surface of the channel are achieved. Pressure drop of the latticework channel is also measured by pressure taps. The result shows that these two latticework models have different flow and heat transfer characteristics. The Nusselt number distribution is not similar to that of traditional jet array impingement. The range of Nusselt number enhancement is 2.3 to 6.4 compared to that of a smooth convective channel (the Nusselt number is based on the channel hydraulic diameter). The jet-to-target distance could reduce the overall averaged heat transfer on side wall. But it could also lead to a high Nu region. To the normal lattice model, more sub-channels there are, more pressure loss it has. To the novel lattice model, sub-channel number cannot affect the pressure loss, but the jet-to-target distance could affect the friction factor obviously.
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Bunker, Ronald S. "Latticework (Vortex) Cooling Effectiveness: Part 1 — Stationary Channel Experiments." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-54157.
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The present investigation provides detailed information concerning the heat transfer coefficients and pressures in latticework (vortex) cooling channels. Two test methods are used to determine the local and overall heat transfer coefficients for a vortex channel with crossing angle of 45-degrees. Both liquid crystal and infrared thermography methods are used on acrylic and metallic models to discern the heat transfer coefficients without and with the effects of internal rib fin effectiveness. Tests with insulating ribs determine the heat transfer on the primary surfaces representing the pressure and suction side walls of an airfoil. Tests with integral metal ribs determine the additional impact of the fin effectiveness provided by the ribs. A simple radial vortex channel design is employed throughout with subchannel aspect ratios near unity, and Reynolds numbers from 20,000 to 100,000. Pressure loss variations through typical vortex channels are also measured. The objectives of this research are to show the detailed development of heat transfer in vortex channels leading to an understanding of the two main effects of turning and fin enhancements. Detailed primary surface heat transfer coefficients average about 1.5 over smooth duct behavior, but reach local values of about 3 immediately after each turn. Pressure distributions show high turning losses on the order of those associated with serpentine 180-degree turn circuits. Local heat transfer coefficient distributions are remarkably uniform throughout the channels excepting the turns themselves. Turn enhancements are retained for relatively long distances. Overall vortex channel heat transfer coefficient enhancement levels are shown to be 2.5 to 3. The effects of subchannel internal ribs, which act as fins, are shown to be very important in the overall thermal picture. Test results show that treatment of the ribs as simple fins is appropriate and that each rib surface has about the same heat transfer coefficient on average as that of the primary surface. This first detailed study shows that latticework channels have significant potential and should be further investigated.
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Luan, Yigang, Lianfeng Yang, Bo Wan, and Tao Sun. "Large Eddy Simulation of Flow and Heat Transfer Mechanism in Matrix Cooling Channel." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63515.
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Gas turbine engines have been widely used in modern industry especially in the aviation, marine and energy fields. The efficiency of gas turbines directly affects the economy and emissions. It’s acknowledged that the higher turbine inlet temperatures contribute to the overall gas turbine engine efficiency. Since the components are subject to the heat load, the internal cooling technology of turbine blades is of vital importance to ensure the safe and normal operation. This paper is focused on exploring the flow and heat transfer mechanism in matrix cooling channels. In order to analyze the internal flow field characteristics of this cooling configuration at a Reynolds number of 30000 accurately, large eddy simulation method is carried out. Methods of vortex identification and field synergy are employed to study its flow field. Cross-sectional views of velocity in three subchannels at different positions have been presented. The results show that the airflow is strongly disturbed by the bending part. It’s concluded that due to the bending structure, the airflow becomes complex and disordered. When the airflow goes from the inlet to the turning, some small-sized and discontinuous vortices are formed. Behind the bending structure, the size of the vortices becomes big and the vortices fill the subchannels. Because of the structure of latticework, the airflow is affected by each other. Airflow in one subchannel can exert a shear force on another airflow in the opposite subchannel. It’s the force whose direction is the same as the vortex that enhances the longitudinal vortices. And the longitudinal vortices contribute to the energy exchange of the internal airflow and the heat transfer between airflow and walls. Besides, a comparison of the CFD results and the experimental data is made to prove that the numerical simulation methods are reasonable and acceptable.