In this Letter, we report a simple approach for the preparation of bioinspired nacre-like structured materials with achievable high in-plane or through-plane thermal conductivity via digital light processing 3D printing under optimized printing parameters. Based on the 3D layer-by-layer formation, a vertical force exerted on each printing layer during the 3D printing process makes 2D platelets well-ordered in ultraviolet curable resin (hereafter UV resin), which is proved by the images of the scanning electron microscope and spectra of x-ray diffraction. It is found that a lower printing layer thickness leads to a higher orientation of Al2O3 platelets in the UV resin and greater thermal conductivity of the composites. The thermal conductivity of the structured composites reaches up to 2.622 W m−1 K−1 along the oriented direction at the loading of 30 wt. % of 2D Al2O3 platelets under the designed 3D printing layer thickness of 15 μm, which is about 14 times greater than that of pure UV resin. The surface temperature variations of the composites with time during heating and cooling, observed from the infrared thermograph, indicate the great potential of the 3D-printed structured materials for thermal management applications in electronic devices and electric equipment. It is predicted that fillers with greater intrinsic thermal conductivity and a larger diameter than the 3D printing layer thickness will lead to composites with greater thermal dissipation capability.

The two-dimensional unsteady heat transfer model is been established. Analyzing on heat storage-release property of phase change thermal storage device within the fluid parallel spiral pipes in various conditions, suggestions are put forward to strengthen thermal storage for the device.

based on previous studies heat storage device structure was optimized and a rectangular tube array encapsulated phase change heat storage device was designed. Compared to sleeve heat accumulator, the heat transfer area was increased 2 times and phase change material thickness was reduced, which has greatly reduced the thermal resistance and improved the heat transfer coefficient. Thermal performance experiment bench of phase change heat storage device was built; heat storage performance experiment was carried on and the results were analysed.

Flow field uniformity in the process of pressure pre-cooling can ensure fruit and vegetable pre-cooling effect. Flow field of pre-cooling packing boxes under 5 different opening modes were calculated through numerical simulation, including velocity distribution, temperature distribution and pressure distribution. The simulation results were also verified by experiment. Both theoretical and experimental results showed that the greater the external covering opening ratio, the faster the cooling. Temperature of the measure points away from the pressure fan side with a small opening ratio reduced more rapidly than that with a big external opening ratio. The opening ratio of the external covering should be lower close to pressure fan side than that away from it. Therefore in actual pre-cooling work, the opening ratio close to pressure fan side should be lower than that away from it. The diameter of the openings distributed at the lower part should be smaller than that of the openings distributed at the upper part of the external covering and this can overcome pre-cooling non-uniformity between upper and lower layers.