ma Ting

• PhD
• Professor at Xi'an Jiaotong University

This study proposes a novel multi-scale numerical method for thermal-mechanical analysis of mini-channel heat exchangers (MCHEs) under internal fluid pressure and temperature loads. The method comprises a macro-scale model for global analysis and a meso-scale model for detailed sub-model analysis, specifically focusing on the internal fluid pressur...

Radio frequency (RF) breakdown is one of the crucial factors limiting the power capacity of high-power microwave (HPM) generators. In this paper, a waveguide cavity has been designed to study quantitatively the influence of temperature on high-gradient RF breakdown. The two planes of the waveguide cavity are divided into a strong-field side and a w...

CO 2 hydrate is a potential cold thermal energy storage material with latent heat of 500 kJ/kg, however, the dissociation principle of CO 2 hydrate is different from that of solid-liquid phase change materials and therefore, exploring the dissociation mechanism of CO 2 hydrate is of great significance for efficient cold storage. In this paper, a ne...

Microchannel heat exchangers are characterized by high heat transfer efficiency and compact volume. The accuracy of microchannel wall temperature measurement directly affects the measurement result of the heat transfer coefficient. The water bath can control the heat flux in the microchannel heat transfer experiment with good uniformity of heat flu...

Heat exchangers are one of the key components to ensure the safe and efficient operation of nuclear energy systems. Additive manufacturing offers the processing solutions of advanced heat exchangers based on triply periodic minimal surfaces (TPMS). TPMS has superior mechanical and thermal–hydraulic performance that provides excellent energy-saving...

Printed circuit heat exchanger (PCHE) has the potential to replace the traditional heat exchangers in lead–bismuth fast reactors due to the high compactness. In this work, a segmented Log-Mean Temperature Difference (LMTD) method is applied to design a PCHE used for a 280 MWth lead–bismuth fast reactor. The structural strength is checked based on t...

Relativistic backward wave oscillator is a high-power microwave generator with great application potential. Since a large amount of waste electron are deposited on the collector, the temperature of the collector rises, which reduces the safety and stability of relativistic backward wave oscillator. The collector temperature characteristics are calc...

The printed circuit heat exchanger is a typical representative of mini-channel heat exchangers, which are generally applied in many advanced energy and power systems due to their high compactness and efficiency. However, axial heat conduction may significantly decrease efficiency at low mass flow rates, and few studies have focused on enhancing the...

Printed circuit heat exchangers (PCHEs) have great potential to be employed in the advanced nuclear reactor systems. In this work, the equivalent thermal conduction resistance of PCHE is studied. The influences of thermal convection resistance are analyzed. The results indicate that the equivalent thermal conduction resistance of PCHEs with unequal...

The printed circuit heat exchanger (PCHE) is one of the leading heat exchanger candidates in the supercritical carbon dioxide Brayton cycle, which has high efficiency and compactness. In the present paper, a novel type of PCHE with airfoil fins was proposed and tested. The effect of the thermal resistance variation on the heat transfer performance...

Improving the heat transfer performance of phase change material (PCM) plays a crucial role in designing efficient latent heat thermal energy storage (LHTES) systems. The purpose of this study is to address and elucidate the effects of the metal foam-fin hybrid structure and the inclination angle on the phase change process by using the numerical s...

Phase change materials (PCMs) have been considered suitable energy materials to address the mismatch between energy demand and supply to improve the utilization efficiency of the latent heat thermal energy storage (LHTES) system. However, the relatively low thermal conductivity of PCMs leads to an undesirable thermal response rate of the LHTES syst...

Effective cooling technology is intensely demanded to cool the electronic devices within small space under high heat flux. Mini-grooved flat heat pipe (FHP) with simple structure, close contact with heat source, uniform temperature and high thermal conductivity can satisfy the demand of transferring the great heat rapidly and weakening the hot spot...

Sharing advantages of high compactness, SCO2 Brayton cycle and thermoelectric generator are both considered promising energy conversion solutions and have attracted great attention due to the increasing energy shortage and global climate change. The integration of thermoelectric generators in the SCO2 Brayton cycle will remain the inherent advantag...

The efficient and accurate prediction of fuel pyrolysis and surface coking in regenerative cooling systems is critical to developing hypersonic vehicles. This study adopts a combined method based on the chemical reaction kinetics and corresponding states principle to establish a simplified RP-3 fuel pyrolysis model. The chemical reactions are decre...

Hydrogen cooler is a key equipment of the precooling unit in hydrogen refueling stations with the requirement of high heat transfer efficiency, high compactness and high pressure resistance. Printed circuit heat exchanger is a promising candidate for the hydrogen cooler due to its great performance on extremely high pressure and high temperature wo...

The intermediate heat exchanger (IHX) is one of the key components in advanced nuclear reactor power generation system. Printed circuit heat exchanger (PCHE) with mini-channels is a good candidate for the IHX. But the whole PCHE with tens of thousands of mini-channels is hard to be modeled and calculated at high temperature. Thus, the homogenizatio...

Fuel pyrolysis is a common phenomenon in regenerative cooling channels. However, the alkenes and aromatic hydrocarbons produced by thermal cracking tend to deposit on the channel surface, leading to local heat transfer deterioration, corrosion resistance reduction, or blockage. This study establishes a numerical investigation at a supercritical pre...

Micro gas turbine is a typical distributed energy resource system. The temperature of the burning gas in the combustor reaches 1000 K or even more, which makes a huge temperature difference in the combustor an interesting topic for heat recovery. In this work, thermoelectric devices are used for heat recovery in the combustor of the micro gas turbi...

The development of phase change materials (PCMs) is hampered by issues like leakage, poor thermal conductivity, and poor light absorption. In this study, we innovatively combined modified melamine foam (MF) and graphene nanoparticle (GNP) to address these defects of PCMs in the solar-thermal energy system. The MF was modified to endow the solar-the...

Printed circuit heat exchanger (PCHE) is considered a promising candidate for accelerator driven systems (ADS) due to its high compactness and efficiency. The preeminent high-temperature, high-pressure and corrosion resistance enables it to withstand the severe conditions of ADS and ensure the safe and efficient operation. In this paper, a PCHE app...

The discontinuous airfoil-fin printed circuit heat exchanger is a leading candidate due to its high compactness, high efficiency, and ability to endure extreme conditions. In this paper, an unusual asymmetric airfoil-fin heat exchanger is experimentally investigated using the supercritical carbon dioxide and water experimental system. The effects o...

To further improve the performance of thermal energy storage (TES) system with phase change materials (PCMs), this paper proposed a novel method, i.e. combining the additions of TiO2 nanoparticles, metal foam and the provision of ultrasonic field, investigated its synergetic effects in enhancing conduction and convection heat transfer. The thermal...

Printed circuit heat exchanger is considered as an ideal candidate for floating storage and regasification unit of liquefied natural gas due to its high compactness and efficiency. The flow maldistribution is an essential issue in practical applications of the printed circuit heat exchanger, which leads to the performance degradation. In this study...

Liquefied natural gas (LNG) is a clean energy source that shows great potential for further development. In the production and transportation process of LNG, heat exchanger is an essential device that conducts the liquefaction and vaporization operations. With the booming development of floating LNG (FLNG) technology, higher requirements have been...

Supercritical carbon dioxide (SCO2) Brayton cycle has been widely used in a variety of industrial settings. In this work, three commonly used SCO2 Brayton cycle dynamic numerical models at different heat source temperatures are built with MATLAB and Simulink software, and the key parameters of three commonly used Brayton cycle models (recompression...

Determining and modelling the effective thermal conductivity of nanofluids is always a concern of investigators. The effect of nanoparticles' shape on the effective thermal conductivity of nanofluids has not been accurately correlated with other influencing factors such as temperature and nanoparticle concentration. The main purpose of this study i...

Composite Phase Change Materials (CPCMs) using metal foam as core material are highly promising for thermal management of photovoltaics. Selecting a proper CPCM for a given application is challenging. To address this, we developed a pore-scale lattice Boltzmann model based on X-ray micro-Computed Tomography to describe the complicated microstructur...

Printed circuit heat exchangers with high heat transfer efficiency, small volume and high pressure resistance are usually chosen as a precooler for the supercritical carbon dioxide Brayton cycle. The supercritical carbon dioxide channel has high pressure and small mass flow rate, but the water channel has low pressure and large mass flow rate. The...

Photovoltaics, as a direct technology to convert sunlight into electricity, possess significant potential to deal with ever-increasing environmental problems and the desire to reduce the use of fossil fuels. Thermal stability of photovoltaics is of major concern when considering large-scale commercialization under conditions in which device degrada...

Due to the flexibility and lightness, flexible thermoelectric (TE) technology shows great potential in the field of renewable energy and low-temperature waste heat collection. In recent years, a lot of efforts have been made to improve the efficiency of flexible TE technology, such as synthesizing high-performance flexible TE materials, improving t...

The rapid change in the amount of carbon dioxide released into the atmosphere stimulates the advancement of advanced space launchers. Liquefied air cycle engine is a pollution-free space launcher and attracts much attention in recent years. Air-hydrogen precooler is an important component in the liquefied air cycle engines. The thermal–hydraulic pe...

This Virtual Special Issue includes six peer-reviewed papers, which were selected from the plenary lectures, keynote lectures and conference papers at the 5th International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT2019) in Novosibirsk, Russia on August 13–16, 2019. The topics of these papers mainly focus...

Recuperator and precooler are key components of supercritical CO2 Brayton cycle. One of promising candidates is printed circuit heat exchanger (PCHE) due to its high compactness and heat transfer performance. However, both of them operate at high pressure, which is a great challenge for their safety. Therefore, accurate and quick mechanical stress...

In this paper, lattice Boltzmann method was used to simulate the flow and heat transfer process in porous composite phase change material with acoustic streaming, in order to investigate the mechanism of heat transfer enhancement caused by acoustic streaming. The study focused on the effect of acoustic streaming at different Rayleigh number, Prandt...

Printed circuit heat exchanger is considered a promising candidate for floating natural gas liquefaction because of its high compactness, high pressure resistance, and high efficiency. In this work, a numerical model is established to study the thermal-hydraulic characteristics of transcritical natural gas in the printed circuit heat exchanger in r...

Nanofluids have received increasing attention in research and development in the area of renewable and sustainable energy systems. The addition of a small amount of high thermal conductivity solid nanoparticles could improve the thermophysical properties of a base fluid and lead to heat transfer augmentation. Various enhancement mechanisms and flow...

The main cryogenic heat exchanger is a core piece of equipment in the liquefaction of natural gas. The printed circuit heat exchanger is gradually becoming a primary choice for the main cryogenic heat exchanger, because it has good pressure resistance, high efficiency, and compactness. In this work, a numerical simulation is conducted to examine th...

Composite Phase Change Materials (PCMs) incorporated with metal foams are promising candidates for thermal management for space exploration. However, void cavities are generated as a result of the volume change of PCM during the melting process, introducing a resistance to heat transfer due to the low thermal conductivity of the void. In this work,...

Supercritical carbon dioxide (SCO2) Brayton cycle is widely known as highly potential bottoming cycle among energy conversion systems in the future due to its low requirement to heat source, high efficiency and small volume. Recently, SCO2 Brayton cycle has been considered utilized in marine industry. In marine environment, unstable disturbance due...

Gas-gas plate heat exchanger is an important component to remove heat generated from electronic devices in the cabinet cooling system. The counter-flow plate heat exchanger is usually used due to its higher heat transfer performance than the cross-flow plate heat exchanger. However, in the cabinet cooling system, the overall dimensions for the heat...

The printed circuit heat exchanger (PCHE) is widely used in a variety of extremely high temperature and high pressure applications. Since the PCHE is a typical multi-channel heat exchanger, the flow maldistribution may happen in the PCHE channels. In this paper, a new mathematical model is established to predict the flow maldistribution in a PCHE a...

Phase change materials (PCM) are promising for wide ranging applications in thermal control of electronics due to the remarkable thermal energy storage capacity. The solid-liquid phase change process is coupled with acceleration for applications in aerospace, which tends to induce unstable heat transfer phenomenon in the latent heat thermal energy...

Energy-harvesting devices, consisting of thermoelectric modules and phase change materials (PCMs), can extract energy from the ambient environment for the self-power supply of many small electronic devices such as wireless sensors. However, due to the distinct temperature ranges of various seasons in different places, these devices' power generatio...

Printed circuit heat exchanger (PCHE) is a promising candidate of coolers used for SCO2 Brayton cycle. The thermal-hydraulic performance of SCO2 in a PCHE depends on the PCHE structure as well as the operating conditions of SCO2 due to its dramatic variation of thermal physical properties near the pseudo-critical point. This work experimentally inv...

Printed circuit heat exchangers (PCHEs) have attracted wide attention in the nuclear energy field owing to their high compactness, strong pressure endurance, and high heat transfer capacity. In situations where corrosion resistance or light weight is required, PCHEs made of titanium exhibit obvious advantages. However, the corrosion resistance of t...

A thermoelectric-hydraulic numerical model is built for thermoelectric recuperators with wavy and straight fins under large longitudinal temperature difference, and their performance is analyzed. It is found that the comprehensive performance of the wavy-fin thermoelectric recuperator is better than that of straight-fin thermoelectric recuperator....

Latent heat thermal energy storage with metal foams has been considered as a promising candidate for thermal management in aerospace systems. Thus, there is good cause to deeply explore the heat transfer mechanisms of phase change material (PCM) melting with metal foams. In order to get close to the real situation, a three-dimensional, pore-scale l...

The invention relates to a spiral plug-flow channel plate type heat exchanger. The spiral plug-flow channel plate type heat exchanger is composed of a heat exchanging core, an inlet flow guiding section, an outlet flow guiding section, a hot fluid inlet and outlet and a cold fluid inlet and outlet. The heat exchanging core of the heat exchanger ado...

Printed circuit heat exchangers are considered as one of the most promising candidates for the supercritical carbon dioxide Brayton cycle due to its high pressure resistance and high compactness. It is a critical component to exchange the heat between the primary loop and the secondary loop, which directly relates to the overall efficiency of the B...

Thermoelectric power generators (TEGs) have received considerable attention in the vehicular waste heat recovery. Large temperature difference between hot-side end and cold-side end of TE modules should be maintained to keep large power generation. However, the scaling-up problem of inevitably temperature drop of exhaust gas along the flow directio...

In general, constant flow rates are assumed for thermal design of heat exchangers. However, the constant flow rates are not available in the heat exchangers used for fan-supplied systems. In this paper, a coupling ε-NTU method is presented to calculate the cooling efficiency of a fan-supplied cabinet cooling system, in which the pressure-flow rate...

In the supercritical CO2 recompression Brayton cycle, recuperators play an important role in cycle efficiency and operating performance. In this work, a dynamic model of the supercritical CO2 recompression Brayton cycle is developed. The effects of high-temperature and low-temperature recuperators on the dynamic characteristics of the cycle are exa...

Thermoelectric modules are usually sandwiched between hot-side and cold-side heat exchangers to generate electrical power. But the sandwiched structures are unsuitable for recuperators because large thermal resistance caused by the thermoelectric modules significantly reduces the heat transfer efficiency. In order to maintain heat transfer efficien...

Latent thermal energy storage has been recommended as an effective technique to the thermal management system of space exploration due to its excellent ability of storing thermal energy. In the current work, the melting process of phase change material under supergravity conditions (3g, 5g, 7g) are numerically investigated by a pore-scale lattice B...

In this paper, an optimization method combined computational fluid dynamics model (CFD), back propagation neural network (BPNN) model and genetic algorithm (GA) is proposed to optimize the performance of a novel concept of thermoelectric generator integrated recuperator (TEGR). Three geometrical parameters of TEGR including fin thickness, fin pitch...

PCHE (Printed Circuit Heat Exchanger) is deemed as the most promising candidate for cryogenic heat transfer process in Liquefied Natural Gas - Floating Production Storage and Offloading due to its high compactness and efficiency. In this paper, numerical study is conducted to investigate the thermal characteristics of natural gas with phase changin...

Nuclear power is considered as the most promising energy for power generation due to low carbon emission, small fuel cost, high efficiency and reliability. As a new type of heat exchanger, printed circuit heat exchanger (PCHE) with high compactness and efficiency can be used for the supercritical carbon dioxide (SCO2) Brayton power cycle in the Gen...

In this paper, the steam condensation mixed with nitrogen is experimentally investigated to examine the effect of non-condensable gas on the steam condensation process at high speed. The mass flux of steam/nitrogen mixture is in the range of 159.2–464.6 kg/(m²·s), the nitrogen mass fraction is up to 10%, and the inlet pressure ranges between 0.15 a...

Thermal management of micro electronic devices is one of the major issues for electronics application. Mini-grooves flat heat pipe is suitable to be used for small space electronics rapid cooling due to its high thermal conductivity, simple structure and good temperature uniformity. In this paper, an axial fluid flow and heat transfer mathematical...

The demand of compactness and lightweight for thermoelectric applications requires optimized system integration of thermoelectric module and heat sinks to achieve the best performance under size and weight constraints. This work studies the thermal resistance matching (i.e., optimal thermal resistance allocation of thermoelectric module and heat si...

To help study the performance of thermoelectric power generators in conditions where there are large temperature differences between the hot-side heat exchanger and the cold-side heat exchanger, this paper presents a simplified numerical model that includes temperature-dependent properties of thermoelectric materials. Specifically, the temperature...