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Статті в журналах з теми "Heat transfer capability"

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Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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1

Huminic, Gabriela, and Angel Huminic. "Heat transfer capability of the hybrid nanofluids for heat transfer applications." Journal of Molecular Liquids 272 (December 2018): 857–70. http://dx.doi.org/10.1016/j.molliq.2018.10.095.

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2

Yan, Man Fu, and Jiu Hai Wang. "Improvement of Transductive Support Vector Machine and its Application to Enhance Antifreeze Heat Transfer Capability in Ground Source Heat Pump System." Applied Mechanics and Materials 204-208 (October 2012): 4349–55. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.4349.

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Анотація:

To solve the problem of enhancing the heat transfer capability of antifreeze mixture in a ground source heat pump system, the existing Transductive Support Vector Machine (TSVM) model was updated into an improved TSVM model. Also, a new method of mixed antifreeze heat transfer capability classification was given in the paper by analyzing antifreeze [1] heat transfer capability of the ground source heat pump system and applying the improved TSVM model.

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3

Wang, Jiu Hai, and Man Fu Yan. "Improvement of Proximal Support Vector Machine and its Application to Enhance Antifreeze Heat Transfer Capability in Ground Source Heat Pump System." Advanced Materials Research 594-597 (November 2012): 2186–91. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.2186.

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Анотація:

To solve the problem of enhancing the heat transfer capability of antifreeze mixture in a ground source heat pump system, the existing proximal support vector machines [1] was updated into a weighted Proximal Support Vector Machine (PSVM) model. Also, a new classification method of mixed antifreeze heat transfer capability was given in the paper by analyzing antifreeze [2] heat transfer capability of the ground source heat pump system and applying the weighted PSVM mode.

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4

Small, Evan, Sadegh M. Sadeghipour, and Mehdi Asheghi. "Heat Sinks With Enhanced Heat Transfer Capability for Electronic Cooling Applications." Journal of Electronic Packaging 128, no. 3 (November 7, 2005): 285–90. http://dx.doi.org/10.1115/1.2229230.

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In a competition at Carnegie Mellon University, the mechanical engineering students designed and manufactured 27 heat sinks. The heat sinks were then tested for thermal performance in cooling a mock processor. A heat sink with three rows of 9, 8, and 9 dimpled rectangular fins in staggered configuration performed the best, while having the least total volume (about 25% less than the set value). Validation of the observed thermal performance of this heat sink by experimentation and numerical simulations has motivated the present investigation. Thermal performance of the heat sinks with and without dimples have been evaluated and compared. Results of both the measurements and simulations indicate that dimples do in fact improve heat transfer capability of the heat sinks. However, dimples cause more pressure drop in the air flow. Keeping the total volume of the heat sink and the height of the fins constant and changing the number of the fins and their arrangement show that there is an optimum number of fins for the best performance of the heat sink. The optimum fin numbers are different for inline and staggered arrangements.

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5

Lamas, Bruno, Bruno Abreu, Alexandra Fonseca, Nelson Martins, and Mónica Oliveira. "Long-Term MWCNTs Nanofluids toward Heat Transfer Capability Improvement." Journal of Physical Chemistry C 117, no. 24 (June 11, 2013): 12826–34. http://dx.doi.org/10.1021/jp401271c.

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6

Mulla, Mohammed Fahimuddin, Irfan Anjum Badruddin, N. Nik-Ghazali, Mohammed Ridha Muhamad, Ahamed Saleel C., and Poo Balan Ganesan. "Investigation of heat transfer in porous channels." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 3 (October 5, 2019): 1497–517. http://dx.doi.org/10.1108/hff-03-2019-0203.

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Purpose This paper aims to investigate the heat transfer in porous channels. Design/methodology/approach Finite element method is used to simulate the heat transfer in porous channels. Findings The number and width of channels play a key role in determining the heat transfer of the porous channel. The heat transfer is higher around the channel legs. Smaller base height is better to get higher heat transfer capability. Originality/value This study represents the original work to investigate heat transfer in a porous domain having multiple channels.

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7

Peterson, G. P., and H. B. Ma. "Temperature Response of Heat Transport in a Micro Heat Pipe." Journal of Heat Transfer 121, no. 2 (May 1, 1999): 438–45. http://dx.doi.org/10.1115/1.2825997.

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Анотація:

A detailed mathematical model for predicting the heat transport capability and temperature gradients that contribute to the overall axial temperature drop as a function of heat transfer in a micro heat pipe has been developed. The model utilizes a third-order ordinary differential equation, which governs the fluid flow and heat transfer in the evaporating thin film region; an analytical solution for the two-dimension heat conduction equation, which governs the macro evaporating film region in the triangular corners; the effects of the vapor flow on the liquid flow in the micro heat pipe; the flow and condensation of the thin film caused by the surface tension in the condenser; and the capillary flow along the axial direction of the micro heat pipe. With this model, the temperature distribution along the axial direction of the heat pipe and the effect on the heat transfer can be predicted. In order to verify the model presented here, an experimental investigation was also conducted and a comparison with experimental data made. This comparison indicated excellent correlation between the analytical model and experimental results, and as a result, the analysis provides a better understanding of the heat transfer capability and temperature variations occurring in micro heat pipes.

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8

Ju, Jian Liang, Zhi Gang Zhang, and Wei Zhang. "Analysis on the Selection of Working Fluid in the Small Diameter Gravity Heat Pipe - Based on a New Passive Technology." Applied Mechanics and Materials 368-370 (August 2013): 661–65. http://dx.doi.org/10.4028/www.scientific.net/amm.368-370.661.

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This paper discusses the suitable working fluid applying in small diameter (millimeter scale) gravity heat pipe theoretically. The working temperature, characteristics of material, heat transfer limit and thermal physical properties of working medium of the heat pipe were studied. It is concluded that each aspect capability of heat transfer of R717 is excellent, but its working pressure is a bit high; the synthesized capability of R134a is relatively ideal and can be chosen as the working medium.

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9

Lei, Xianliang, Ziman Guo, Ruifeng Peng, and Huixiong Li. "Numerical Analysis on the Heat Transfer Characteristics of Supercritical Water in Vertically Upward Internally Ribbed Tubes." Water 13, no. 5 (February 27, 2021): 621. http://dx.doi.org/10.3390/w13050621.

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Internally ribbed tubes (IRTs) with better heat transfer capability have been widely applied in many fields. Several studies focused on the flow and heat transfer in IRTs with special structure configurations, but there is still lack of clear understanding regarding the influence of spiral ribs/grooves on the local flow structure and heat transfer capability of supercritical water. In the present paper, numerical simulation on turbulent heat transfer of supercritical water through a vertically upward IRTs is investigated. It is found at low heat fluxes, heat transfer enhancement occurs; the temperature of IRT is lower than that in the smooth tube by 6~7 °C, but at high heat fluxes; deteriorated heat transfer occurs in ST rather than in IRTs; the maximum temperature difference reaches 36 °C. The heat transfer ratio between IRT and ST is about 1.81 in the pseudocritical region, where the velocity deviation is about 20–50%. Once the deterioration heat transfer exists, a thin layer with high temperature but low density and low thermal conductivity so that (with a 20% reduction) fluids will be covered on the surfaces. Effects of rib height, width, lift angle and threads on turbulent heat transfer are analyzed, an optimum rib structure based on the performance evaluation criteria is obtained (α = 50°, e = 0.58 mm, S = 3.5 mm, m = 6), which can achieve the best performance.

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10

Anand, A. R. "Effect of various parameters on heat transport capability of axially grooved heat pipes." Thermal Science and Engineering Progress 24 (August 2021): 100890. http://dx.doi.org/10.1016/j.tsep.2021.100890.

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11

Gershuni, A., A. P. Nishchik, and Victor Razumovskiy. "COMPARATIVE ANALYSIS OF HEAT-TRANSFER CAPABILITY OF EVAPORATION-CONDENSATION AND RECUPERATIVE TUBULAR HEAT EXCHANGERS." Heat Pipe Science and Technology, An International Journal 6, no. 1-2 (2015): 11–23. http://dx.doi.org/10.1615/heatpipescietech.2016010994.

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12

Rullière, Romuald, Frédéric Lefèvre, and Monique Lallemand. "Prediction of the maximum heat transfer capability of two-phase heat spreaders – Experimental validation." International Journal of Heat and Mass Transfer 50, no. 7-8 (April 2007): 1255–62. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2006.09.015.

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13

Qian, Zhong, and Hai Min Wang. "Transient Heat Transfer Analysis of a Micro Heat Exchanger." Applied Mechanics and Materials 455 (November 2013): 330–34. http://dx.doi.org/10.4028/www.scientific.net/amm.455.330.

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Анотація:

The research object is a micro heat exchanger (MHT) applied in chip cooling, a three dimensional simulation model is developed to analyze the transient heat transfer of the exchanger according to both exponential and periodic heat fluxes. Based on the computational results of the profiles of temperature and thermal stress, a comparison of performance of heat exchangers made of copper and silicon nitride compound is carried out. The results indicate that the capability of a copper heat exchanger is better than that of a silicon nitride exchanger under low load working condition due to the excellent thermal conductivity of copper. However, with large load fluctuations, the advantage of structure strength of compound makes the exchanger attractive since it has lower thermal stress and could guarantee a long-term stability. The efforts of this paper are referable for further research and development of micro heat exchangers.

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14

Luo, Yi, Zhi Xin Li, Zi Cheng Yu, and Xiao Dong Wang. "Influence of Parallel and Trapezoidal Wick Structures to the Heat Transfer Capability of MHPs." Applied Mechanics and Materials 868 (July 2017): 33–38. http://dx.doi.org/10.4028/www.scientific.net/amm.868.33.

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Heat transfer capability of micro heat pipe (MHP) is relied on the thermal resistance of material, the specific phase change latent heat of working fluid, and the pattern of micro structures which is served as wick. In this paper, parallel and trapezoidal micro Cu structures were designed and fabricated by UV-LIGA. The capillary pressure and the effective coefficient of heat transfer conductivity of the micro grooves were calculated and results showed that trapezoidal grooves with small dimension in evaporator and large dimension in condenser (forward trapezoidal) have the best performance, because this structure can generate larger capillary force of working fluid and enhance the heat transfer. Two MHPs based on the calculations were fabricated and tested, results demonstrated that forward trapezoidal groove had the lowest equilibrium temperature while the inversed trapezoidal groove had the highest equilibrium temperature, approved the numerical calculation results. When the input power was 10W, the equilibrium temperature of forward trapezoidal, parallel and backward trapezoidal grooved MHP was 67.2 oC, 73.4°C and 89.1 oC, respectively. The forward trapezoidal grooves enlarge the capillary pressure and benefit the heat transfer of MHP.

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15

Ramasamy, Dhanuskodi, Arunagiri Appusamy, and Anantharaman Narayanan. "Review of the Wall Temperature Prediction Capability of Available Correlations for Heat Transfer at Supercritical Conditions of Water." Journal of Energy 2013 (2013): 1–13. http://dx.doi.org/10.1155/2013/159098.

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Анотація:

The validity of the wall temperature predictions by 18 correlations available in the literature for supercritical heat-transfer regimes of water was verified for 12 experimental datasets consisting of 355 data points available in the literature. The correlations were ranked based on criteria like % data with <5% error, % data with <10°C error and minimum error band in temperature prediction. Details of the best fitting correlations were tabulated. The analysis indicated that for normal heat-transfer conditions, most of the correlations give close predictions. However, at deteriorated heat transfer regimes, only very few prediction points are closer to experimental value. Also, in the ranking process, the first position keeps varying, and no one correlation shall be said as the best for all experiments. Evaluation of the applicability of heat flux to mass-flux-ratio-based prediction of heat-transfer deterioration indicated 75% agreement. The empirical formulae linking mass flux for the prediction of the starting heat flux for heat-transfer deterioration indicated 58.33% of agreement. This review indicated that continued precise experimentation covering wide range of parameter conditions near pseudocritical regime and development of correlations is felt necessary for the accurate prediction of supercritical fluid heat transfer.

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16

Wang, Chun Bo, Xiao Fei Ma, Jiao Zhang, Jin Gui Sheng, and Hong Wei Li. "Combustion and Heat Transfer in 300MW Oxy-Fired CFBB." Advanced Materials Research 354-355 (October 2011): 369–75. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.369.

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A combustion and heat transfer model in oxy-fired CFBB was set. Particle diameter, voidage of the bed ,etc, was analyzed with 30%, 50%, and 70% oxygen. Take a 300MW CFBB for example, the heat transfer characteristics in furnace were numerical simulated. In the sparse zone, heat transfer coefficient is proportional to oxygen concentration at the same voidage of the bed; under the same operation condition, the heat transfer coefficient in CFB increases with the voidage of the bed at first, then it decreases. It was found the heat transfer capability decrease due to the higher concentration of oxygen. It is necessary to set an external heat exchanger to keep a normal combustion

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17

Qu, Jian, Fengbo Guan, Yaojie Lv, and Yalin Wang. "Experimental study on the heat transport capability of micro-grooved oscillating heat pipe." Case Studies in Thermal Engineering 26 (August 2021): 101210. http://dx.doi.org/10.1016/j.csite.2021.101210.

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18

Liu, Donghuan, and Yinghua Liu. "Heat transfer capability simulation of high-temperature heat pipe in supersonic vehicle leading edge applications." Advances in Mechanical Engineering 8, no. 4 (April 21, 2016): 168781401664437. http://dx.doi.org/10.1177/1687814016644375.

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19

Zhang, Jing, Li-xian Lian, Ying Liu, and Ren-quan Wang. "The heat transfer capability prediction of heat pipes based on capillary rise test of wicks." International Journal of Heat and Mass Transfer 164 (January 2021): 120536. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.120536.

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20

Amirnordin, Shahrin Hisham, Hissein Didane Djamal, Mohd Norani Mansor, Amir Khalid, Md Seri Suzairin, and Vijay R. Raghavan. "Pressure Drop and Heat Transfer Characteristics of Louvered Fin Heat Exchangers." Applied Mechanics and Materials 465-466 (December 2013): 500–504. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.500.

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This paper presents the effect of the changes in fin geometry on pressure drop and heat transfer characteristics of louvered fin heat exchanger numerically. Three dimensional simulation using ANSYS Fluent have been conducted for six different configurations at Reynolds number ranging from 200 to 1000 based on louver pitch. The performance of this system has been evaluated by calculating pressure drop and heat transfer coefficient. The result shows that, the fin pitch and the louver pitch have a very considerable effect on pressure drop as well as heat transfer rate. It is observed that increasing the fin pitch will relatively result in an increase in heat transfer rate but at the same time, the pressure drop will decrease. On the other hand, low pressure drop and low heat transfer rate will be obtained when the louver pitch is increased. Final result shows a good agreement between experimental and numerical results of the louvered fin which is about 12%. This indicates the capability of louvered fin in enhancing the performance of heat exchangers.

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21

Kwon, Yeong G., and Jerry D. Ramsey. "Evaluation of Impermeable Protective Garments using Heat Transfer Models." Proceedings of the Human Factors Society Annual Meeting 30, no. 10 (September 1986): 989–93. http://dx.doi.org/10.1177/154193128603001010.

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The heat exchanges between impermeable protective garments and the environment are critical for workers in hot environments such as nuclear power plant workers, chemical workers, metal workers and fire fighters. The increasing availability and capability of the microcomputer make it feasible to use sophisticated heat transfer models and methods to evaluate the comparative effects of different impermeable garment configurations. This paper compares and evaluates several available heat transfer models and presents the results obtained from their use.

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22

Wang, Ziyuan, Xinxi Li, Guoqing Zhang, Youfu Lv, Jieshan He, Jinghai Luo, Chengzhao Yang, and Chuxiong Yang. "Experimental study of a passive thermal management system for three types of battery using copper foam saturated with phase change materials." RSC Advances 7, no. 44 (2017): 27441–48. http://dx.doi.org/10.1039/c7ra03963h.

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23

Sen, Vijay Kumar, Janmejay Jaiswal, Amarnath Nandi, Aliyas Areeckal Varkey, and Aravindakshan Pillai. "Passive Thermal Management of Launch Vehicle Systems using Phase Changing Materials." Defence Science Journal 68, no. 4 (June 26, 2018): 337. http://dx.doi.org/10.14429/dsj.68.10433.

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<p>Electronic systems in expendable launch vehicles and missiles rely on their own thermal inertia to operate for the stipulated time, without overheating, owing to absence of active cooling systems and natural convection at elevated altitude. Traditionally, this inertia is built-into the electronics by increasing its chassis (support structure) mass, proportional to the associated thermal load. For power intensive systems, especially in vehicle upper stages where mass is at premium, this approach results in reduction in payload capability. In the proposed paper, a Heat Sink based on Neopentyl Glycol (NPG) with solid-to-solid phase change (crystalline transformation) is explored as a mass effective alternative due to the material’s capability to absorb a significant amount of energy during phase change. However, due to its lower thermal conductivity, a Thermal Conductivity Enhancer (TCE) to maximize heat transfer had to be employed. The resulting heat sink, utilizing TCE for heat transfer capability and NPG for heat storage capability is called as Hybrid Heat Sink. A heat sink with plate type fins as TCE is realized and a mass reduction factor of 1.4 is achieved against traditional approach. This is followed by a heat sink with pin type fins as TCE where mass reduction factor is increased to 2.6. Effect of thermal cycling and vibration on its performance is also studied.</p>

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24

Hu, Chaobin, and Xiaobing Zhang. "A Godunov type method determining boundary conditions to predict the transient heat transfer in an expanding combustion chamber." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 12 (December 2, 2019): 4925–47. http://dx.doi.org/10.1108/hff-03-2019-0193.

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Purpose This paper aims to improve the reliability of numerical methods for predicting the transient heat transfers in combustion chambers heated internally by moving heat sources. Design/methodology/approach A two-phase fluid dynamic model was used to govern the non-uniformly distributed moving heat sources. A Riemann-problem-based numerical scheme was provided to update the fluid field and provide convective boundary conditions for the heat transfer. The heat conduction in the solids was investigated by using a thermo-mechanical coupled model to obtain a reliable expanding velocity of the heat sources. The coupling between the combustion and the heat transfer is realized based on user subroutines VDFLUX and VUAMP in the commercial software ABAQUS. Findings The capability of the numerical scheme in capturing discontinuities in initial conditions and source terms was validated by comparing the predicted results of commonly used verification cases with the corresponding analytical solutions. The coupled model and the numerical methods are capable of investigating heat transfer problems accompanied by extreme conditions such as transient effects, high-temperature and high-pressure working conditions. Originality/value The work provides a reliable numerical method to obtain boundary conditions for predicting the heat transfers in solids heated by expanding multiphase reactive flows.

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25

Jarrah, H. T., S. S. Mohtasebi, E. Ettefaghi, and F. Jaliliantabar. "Experimental investigation of Silver / Water nanofluid heat transfer in car radiator." Journal of Mechanical Engineering and Sciences 15, no. 1 (March 8, 2021): 7743–53. http://dx.doi.org/10.15282/jmes.15.1.2021.10.0610.

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Анотація:

Currently available fluids for heat transfer including refrigerants, water, ethylene glycol mixture, etc., have been widely exploited in various fields, especially in automobile cooling systems, for many years. However, these fluids possess poor heat transfer capability which means that to achieve acceptable heat transfer activity, high compactness and effectiveness of heat transfer systems are essential. This research work concentrates on preparation and use of water based Silver containing nanofluids in automobile cooling system. Nanoparticles volume fraction, fluid inlet temperature, coolant and air Reynolds numbers were optimized so that the heat transfer performance of the car radiator system was totally improved. It was found that increasing these parameters leads to enhancement of the heat transfer performance. In the best condition, the Ag/water nanofluids with low concentrations could amend heat transfer efficiency up to 30.2% in comparison to pure water.

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26

Santinello, M., M. E. Ricotti, H. Ninokata, G. Haratyk, J. J. Ingremeau, and V. Gourmel. "External heat transfer capability of a submerged SMR containment: The Flexblue case." Progress in Nuclear Energy 96 (April 2017): 62–75. http://dx.doi.org/10.1016/j.pnucene.2016.12.002.

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27

Qiu, Ming, Yong-Zhen Zhang, Bao Shangguan, San-Ming Du, and Zhen-Wei Yan. "The relationships between tribological behaviour and heat-transfer capability of Ti6Al4V alloys." Wear 263, no. 1-6 (September 2007): 653–57. http://dx.doi.org/10.1016/j.wear.2006.12.041.

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28

Wang, Z., J. F. Zhou, H. L. Fan, C. L. Shao, and B. Q. Gu. "Experimental Study on Enhanced Heat Transfer Capability of the Array of Microtubes." Procedia Engineering 130 (2015): 250–55. http://dx.doi.org/10.1016/j.proeng.2015.12.217.

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29

Zhernovyi, Yu V., I. G. Odnorozhenko, D. B. Potyagailo, and Ya P. Romanchuk. "Determination of the heat transfer capability of laser mirrors with cooled cells." Journal of Engineering Physics and Thermophysics 63, no. 3 (September 1992): 863–70. http://dx.doi.org/10.1007/bf00852770.

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30

Tzeng, Sheng Chung, Tzer Ming Jeng, and Zhi Ting Yeh. "Natural Convection Heat Transfer of Annular Metal Porous Medium Heat Sink of LED." Applied Mechanics and Materials 284-287 (January 2013): 844–48. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.844.

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Анотація:

This study used metal porous medium heat sink to replace traditional cooling fins to form a high performance LED cooling system. The metal foamed material has high permeability and cooling area as large as several times of that of traditional fins. With a proper configuration design, it can improve the heat transfer capability of natural convection effectively. This study experimentally investigated the natural convection heat transfer characteristics of the annular metal foamed material, and determined the optimal configuration. The experimental results showed that 1) the heat transfer coefficient (h) increased with ΔT; 2) the (h) decreased as PPI (pores per inch) increased when the thickness (t) of the annular metal foams equaled 5 mm, but the (h) increased as PPI increased when t=11 and 14.5 mm; 3) the (h) increased and then decreased as (t) increased, and there was better heat transfer effect when t=11 mm as shown in the experimental data.

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31

Hou, Tianfeng, Staf Roels, and Hans Janssen. "What affects the performance of POD for the simulation of heat transfer through building component?" Journal of Physics: Conference Series 2069, no. 1 (November 1, 2021): 012215. http://dx.doi.org/10.1088/1742-6596/2069/1/012215.

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Анотація:

Abstract The capability of the proper orthogonal decomposition for the simulation of heat transfer in building components is investigated via three applications: linear heat transfer (not coupled to mass transfer), mildly non-linear heat transfer (coupled to air and moisture transfer (hygroscopic)) and highly non-linear heat transfer (coupled to moisture transfer (capillary)). It is shown that increasing non-linearity leads to an increasing number of required construction modes. To further investigate the reason for this degrading performance of POD, the singular values’ decay progress from the different training snapshots is addressed in this paper. The results confirm that a fast decay of the singular values implies a high interrelation of the snapshots and a better performance of the POD method.

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32

Hong, Sihui, Xinqiang Zhang, Shuangfeng Wang, and Zhengguo Zhang. "Experiment study on heat transfer capability of an innovative gravity assisted ultra-thin looped heat pipe." International Journal of Thermal Sciences 95 (September 2015): 106–14. http://dx.doi.org/10.1016/j.ijthermalsci.2015.04.003.

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33

Galgaro, Antonio, Matteo Cultrera, Giorgia Dalla Santa, and Fabio Peron. "Laboratory thermal conductivity measurements on gravel sample." Acque Sotterranee - Italian Journal of Groundwater 7, no. 3 (September 25, 2018): 67–70. http://dx.doi.org/10.7343/as-2018-344.

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Modern Ground Source Heat Pumps (GSHPs) systems must be designed by taking into account the ground thermal properties, in order to properly plan the capability of the heat pumps to transfer calories through the Ground Source Heat Exchangers (GSHE) to the subsoil (and vice versa). [...]

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34

Fang, Hai Feng, Shi Rong Ge, and Ming Song. "Analysis on Effect of Heat Bridge to Heat Transfer of Refuge Chamber’s Shell." Advanced Materials Research 211-212 (February 2011): 624–28. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.624.

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In order to improve the heat-insulating capability of the refuge chamber’s shell and reduce energy consumption of the cooling system, the horizontal cylindrical mobile refuge chamber for coal mine was taken as the research object. By selecting two connection types between the inner shell and the outer shell for calculation, which were direct connection type and indirect connection type, and comparing these with the connectionless heat transfer, the heat transfer process in the refuge chamber subjected to thermal loadings of constant temperature was respectively discussed with numerical analysis method. Effect of heat bridges to heat transfer of the refuge chamber’s shell was analyzed. The analysis results showed that the average heat flux through direct connection heat bridge and indirect connection heat bridge had respectively increased by 668% and 30% than that of the connectionless heat transfer. The influencing scope of the former was larger than the latter’s. And more heat entered the refuge chamber through the direct connection heat bridge. Therefore, the indirect connection type should be used in the design of the refuge chamber’s shell.

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35

Mustafa, M., Junaid Ahmad Khan, T. Hayat, and A. Alsaedi. "Numerical Solutions for Radiative Heat Transfer in Ferrofluid Flow due to a Rotating Disk: Tiwari and Das Model." International Journal of Nonlinear Sciences and Numerical Simulation 19, no. 1 (February 23, 2018): 1–10. http://dx.doi.org/10.1515/ijnsns-2015-0196.

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AbstractIn this paper, we explore the von-Kármán infinite disk problem for the situation where ferrofluid resides in the space above the rotating disk. Furthermore, flow field is influenced by axial magnetic field. In this study, we treat water as the base fluid which consists of homogeneous suspensions of ${\rm{F}}{{\rm{e}}_{\rm{3}}}{{\rm{O}}_{\rm{4}}}$ ferromagnetic particles. The main motivation here is to resolve heat transfer problem in the existence of non-linear radiative heat transfer. With the aid of von-Kármán relations, the equations of fluid motion and heat transfer are changed into a set of self-similar differential equations. These equations are dealt by an implicit finite-difference method with high precision. The results reveal that wall heat transfer rate can be improved by increasing solid volume fraction of ferromagnetic particles. Drag coefficient at the disk and heat transfer rate are increased as the strength of Lorentz force is enhanced. Viscous dissipation effect has an important part in improving heart transfer process which is vital in some applications. The results demonstrate that cooling capability of magnetite–water nanofluid is much superior to the conventional coolants. An excellent correlation of present results with the previous published articles is found in the all the cases.

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36

Osman, A. M., and J. V. Beck. "Investigation of Transient Heat Transfer Coefficients in Quenching Experiments." Journal of Heat Transfer 112, no. 4 (November 1, 1990): 843–48. http://dx.doi.org/10.1115/1.2910490.

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Methodological and experimental aspects of the estimation of transient heat transfer coefficients in quenching experiments, using inverse heat transfer methods, were addressed and investigated. Beck’s method was used for the estimation of the transient heat transfer coefficient history from interior transient temperature measurements during quenching. Experiments involved plunging a high-purity copper sphere into cooling baths without boiling. The sphere was instrumented with several interior thermocouples for measuring the transient temperature response during quenching. Water and ethylene glycol were investigated. The early transient values of the heat transfer coefficient history were found to be about 100–120 percent higher than the values predicted using well-known empirical correlations for free convection. The later time values were in good agreement with those predicted with empirical correlations. The transient inverse technique has the capability of estimating early transients and subsequent quasi-steady-state values of heat transfer coefficient in a single transient experiment.

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37

Hanlon, M. A., and H. B. Ma. "Evaporation Heat Transfer in Sintered Porous Media." Journal of Heat Transfer 125, no. 4 (July 17, 2003): 644–52. http://dx.doi.org/10.1115/1.1560145.

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A two-dimensional model is presented to predict the overall heat transfer capability for a sintered wick structure. The model considers the absence of bulk fluid at the top surface of the wick, heat conduction resistance through the wick, capillary limitation, and the onset of nucleate boiling. The numerical results show that thin film evaporation occurring only at the top surface of a wick plays an important role in the enhancement of evaporating heat transfer and depends on the thin film evaporation, the particle size, the porosity, and the wick structure thickness. By decreasing the average particle radius, the evaporation heat transfer coefficient can be enhanced. Additionally, there exists an optimum characteristic thickness for maximum heat removal. The maximum superheat allowable for thin film evaporation at the top surface of a wick is presented to be a function of the particle radius, wick porosity, wick structure thickness, and effective thermal conductivity. In order to verify the theoretical analysis, an experimental system was established, and a comparison with the theoretical prediction conducted. Results of the investigation will assist in optimizing the heat transfer performance of sintered porous media in heat pipes and better understanding of thin film evaporation.

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38

Yu, Tian Xiang, Wen Yuan Zhou, Tian Lan Yu, De Qi Peng, and Lei Ye. "Design of an Automatic Cleaning Energy-Saving Technology for Manganese Sulfate Continuous Production Crystallizer." Applied Mechanics and Materials 331 (July 2013): 52–56. http://dx.doi.org/10.4028/www.scientific.net/amm.331.52.

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To deal with the high energy consumption of the batch-type single-effect evaporator for Manganese sulfate production, a vibrating-spiral fluidized automatic cleaning technology was developed for continuous crystallizer production. The proposed method is presented followed by validation through a heat transfer coefficient comparison experiment. The result has shown that the proposed method has strong capability of automatic cleaning of crystalline scale. When the flow velocity in tubes is 0.80 m/s and the heat transfer temperature difference is 17°C, the overall heat transfer coefficient can reach 90% of that of clean tubes without spiral-fluidization. Furthermore, it is ideal to keep the volumetric concentration of fluidization particles at 1% and the automatic cleaning capability is almost directly proportional to the flow velocity. The automatic-cleaning continuous-production crystallizer technology can effectively replace the atmospheric-pressure single-effect evaporator and reduce the energy consumption by 95%. Comparing to the three-effect evaporator, the proposed method can save energy up to 88%.

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39

Cortés, O., G. Urquiza, and J. Alfredo Hernández. "Inverse Heat Transfer Using Levenberg-Marquardt and Particle Swarm Optimization Methods for Heat Source Estimation." Applied Mechanics and Materials 15 (August 2009): 35–40. http://dx.doi.org/10.4028/www.scientific.net/amm.15.35.

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The present work uses the Levenberg-Marquardt Method (LMM) and a Particle Swarm Optimization (PSO) for estimating the heat generation function for a Guarded Hot-Plate Apparatus (GHPA). This device is used for thermal conductivity determination of insulating materials. The problem is one-dimensional in cylindrical coordinates. Geometries are a disc (Hot-Plate) and an annulus (Guard). A heat generation function is estimated considering one to five parameters. Capability of each method for recovering the analytical function is tested. Results are satisfactory for this kind of problem.

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40

Liao, Bai Sheng. "Simulation Research of the Impact on the Heat Transfer Capability of Structural Changes in Tube Heat Exchanger." Advanced Materials Research 255-260 (May 2011): 1378–82. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1378.

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This article apply the CFX computational fluid software of ANSYS software company to casing tube heat exchanger of inside diameter of 10mm, 16mm, wall thickness of 1mm, pipe sections of the counter-flow 1000mm long, including concentric and eccentric placement of three kinds of state and other conditions in different conducted, draw a conclusion that the speed of the fluid and temperature distribution in the tube, and compared the case of three kinds of heat transfer coefficient.

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41

Wan, Zhong Min, Zheng Kai Tu, and Jing Liu. "Performance Investigation on Porous Micro Heat Sink for Cooling of High Power LEDs." Advanced Materials Research 204-210 (February 2011): 1481–84. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.1481.

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A novel porous micro heat sink system is presented for thermal management of high power LEDs, which has high heat transport capability. Numerical model for the micro heat sink is developed to describe liquid flow and heat transfer based on the local thermal equilibrium of porous media, and it is solved with SIMPLE algorithm. The numerical results show that the heated surface temperature of porous micro heat sink is low at high heat fluxes and is much less than the bearable temperature level of LED chips. The heat transfer coefficient of heat sink is very high, and increasing the liquid velocity can enhance the average heat transfer coefficient. The overall pressure loss of heat sink system increases with the increasing the inlet velocity, but the overall pressure drop is much less than the pumping pressure provided by micro pump.

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42

Giacobbe, F. W. "Heat transfer capability of selected binary gaseous mixtures relative to helium and hydrogen." Applied Thermal Engineering 18, no. 3-4 (March 1998): 199–206. http://dx.doi.org/10.1016/s1359-4311(97)00019-7.

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43

Wang, Conger, Wei Jiang, Wenqian Zuo, Guangting Han, and Yuanming Zhang. "Effect of heat-transfer capability on micropore structure of freeze-drying alginate scaffold." Materials Science and Engineering: C 93 (December 2018): 944–49. http://dx.doi.org/10.1016/j.msec.2018.08.055.

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44

Fujiwara, Tsukasa, Yutaka Oda, and Kenichiro Takeishi. "Improvement of Prediction Capability of Conjugate Heat Transfer Analysis Based on LES Data." Proceedings of the Thermal Engineering Conference 2016 (2016): H135. http://dx.doi.org/10.1299/jsmeted.2016.h135.

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45

Wang, Ya-Qiao, Shu-Shen Lyu, Jia-Li Luo, Zhi-Yong Luo, Yuan-Xiang Fu, Yi Heng, Jian-Hui Zhang, and Dong-Chuan Mo. "Copper vertical micro dendrite fin arrays and their superior boiling heat transfer capability." Applied Surface Science 422 (November 2017): 388–93. http://dx.doi.org/10.1016/j.apsusc.2017.05.251.

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46

E, Jia Qiang, Rong Jia Zhu, Hong Yan Zuo, Yan Ping Long, and Xiao Feng Hu. "Simulation and Analysis on Heat Transfer Performance of Oscillating Heat Pipe with Single and Double Passageway." Advanced Materials Research 516-517 (May 2012): 433–37. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.433.

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A relative full-scale numerical simulation has been conducted on oscillating heat pipe(OHP) with single passageway(S-OHP)and double passageway(D-OHP). Mathematical model for studying the influence on the heat transfer performance of the number of passageway was built, including turbulence model, volume of fluid model, continue surface force model, and heat and mass transfer model caused by phase change, and all of which were based on the consideration of gas-liquid interface, wall adhesion angle, surface tension and process of phase change. Results showed that, on the one hand, strong coherence of the initial gas-liquid distribution, as well as the flow phenomena during boiling stage, were found between S-OHP and D-OHP, on the other hand, the heat-transfer capability of the D-OHP is slightly higher than the S-OHP.

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47

Jiaqiang, E., Xiaohuan Zhao, Haili Liu, Jianmei Chen, Wei Zuo, and Qingguo Peng. "Field synergy analysis for enhancing heat transfer capability of a novel narrow-tube closed oscillating heat pipe." Applied Energy 175 (August 2016): 218–28. http://dx.doi.org/10.1016/j.apenergy.2016.05.028.

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48

Mo, Q., and J. T. Liang. "A novel design and experimental study of a cryogenic loop heat pipe with high heat transfer capability." International Journal of Heat and Mass Transfer 49, no. 3-4 (February 2006): 770–76. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2005.08.010.

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49

Nakayama, W., and S. H. Park. "Conjugate Heat Transfer From a Single Surface-Mounted Block to Forced Convective Air Flow in a Channel." Journal of Heat Transfer 118, no. 2 (May 1, 1996): 301–9. http://dx.doi.org/10.1115/1.2825845.

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Conjugate heat transfer from a surface-mounted block (31 × 31 × 7 mm3) to forced convective air flow (1–7 m/s) in a parallel-plate channel was studied experimentally and analytically. Particular attention was directed to the heat flow from the block to the floor through the block support, which was eventually transferred to the air flow over the floor. The concepts of adiabatic wall temperature (Tad) and adiabatic heat transfer coefficient (had) were employed to account for the effect of thermal wake shed from the block on the heat transfer from the floor. The experimental data of Tad and had were used in setting the boundary condition for the numerical analysis of heat conduction in the floor. The accuracy of the numerical predictions of the thermal conductances for different heat flow paths was proven experimentally. The heat conduction analysis code was then used to find the heat transfer capability of various block-support/floor combinations.

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50

Nikparto, Ali, and Meinhard T. Schobeiri. "Combined numerical and experimental investigations of heat transfer of a highly loaded low-pressure turbine blade under periodic inlet flow condition." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 232, no. 7 (February 14, 2018): 769–84. http://dx.doi.org/10.1177/0957650918758158.

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This paper experimentally and numerically investigates heat transfer characteristics of a low-pressure turbine blade under steady/unsteady flow conditions. Generally, the low-pressure turbine blades are not exposed to excessive temperatures that require detailed heat transfer predictions. In aircraft engines, they operate at low Re-numbers causing the inception of large separation bubbles on their suction surface. As documented in previous papers, the results of detailed aerodynamic simulations have shown significant discrepancies with experiments. It was the objective of the current investigation to determine the discrepancies between the experimental and numerical heat transfer results. It is shown that small errors in aero-calculation results in large deviations of heat transfer results. The characteristics of the blades mentioned above, make low-pressure turbine blades suitable candidates for evaluating the predictive capability of any numerical method. Documenting the scope of these discrepancies defines the framework of the current paper. The periodic flow inside the gas turbine engine was simulated using the cascade facility at the Turbomachinery Performance and Flow Research Laboratory (TPFL) of Texas A&M University. In this study, the wakes that originate from stator blades were simulated by moving rods. The instrumented blade was covered with a liquid crystal sheet and it was used to measure heat transfer coefficient. Reynolds-averaged Navier–Stokes equations were used for numerical investigation purposes. Measurements and simulations were conducted at three different Reynolds numbers (110,000, 150,000, and 250,000). Furthermore, for unsteady flow condition, reduced frequencies of the incoming wakes were varied. The current paper includes a comprehensive heat transfer assessment of the predictive capability of Reynolds-averaged Navier–Stokes based tools. The effect of the separation bubbles on heat transfer is thoroughly discussed in this paper. Comparisons of the experimental and numerical results detail the differences and identify the sources of error that leads to in accurate calculations in terms of predicting heat transfer calculation results.

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