Author
Jiang Guannan
Bio: Jiang Guannan is an academic researcher from Zhejiang University. The author has contributed to research in topics: Vortex tube & Gas compressor. The author has an hindex of 1, co-authored 3 publications receiving 8 citations.
Papers
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TL;DR: In this article, a large-scale vortex tube was designed and an experimental device was built to get the internal parameters of a vortex tube, and a five-hole probe and thermocouples were used to obtain the three-dimensional velocities, the static pressure, static temperature and total temperature distributions inside the vortex tube.
Abstract: In order to get the internal parameters of a vortex tube, a large-scale vortex tube was designed and an experimental device was built. A five-hole probe and thermocouples were used to obtain the three-dimensional velocities, the static pressure, static temperature and total temperature distributions inside the vortex tube. Four different cold mass fraction conditions (0.2, 0.4, 0.6 and 0.8) were chosen and the impacts on the internal parameters of the vortex tube were discussed. Different from the traditional view, the tangential velocity was considered to be the steady Burgers vortex form. A reverse flow boundary was found, and the location of which was changed at different operation conditions and axial positions. Further, it was found that the lowest static temperature existed near the nozzle outlet, and a new static temperature difference distribution law was firstly proposed experimentally.
20 citations
Patent•
08 Nov 2019
TL;DR: In this article, a portable cold-hot dual-purpose electric fan based on vortex tubes is presented, which can simultaneously generate cold air and hot air, and has the characteristics of being simple in structure and convenient to carry.
Abstract: The invention discloses a portable cold-hot dual-purpose electric fan based on vortex tubes. The electric fan comprises a fan, a gas compression device, an electric motor used for driving the fan andthe gas compression device, and a vortex tube device connected with the gas compression device, wherein the gas compression device generates high-pressure gas under the driving of the electric motor and the high-pressure gas enters the vortex tube device; and the vortex tube device converts the high-pressure gas into a cold gas flow and a hot gas flow, and the fan drives and diffuses the cold gasflow to a space requiring cooling or drives and diffuses the hot gas flow to a space requiring heating. The electric fan can simultaneously generate cold air and hot air, and has the characteristics of being simple in structure and convenient to carry.
Patent•
05 Nov 2019
TL;DR: In this article, the authors described a refrigeration and heating device based on a vortex tube, which can be used for camping in the wild without power supply provision and abundant wind power resources.
Abstract: The invention discloses a refrigeration and heating device based on a vortex tube. The refrigeration and heating device based on the vortex tube is characterized by comprising a drive device, a gas compression device and a vortex tube device, wherein the drive device drives the gas compression device to generate high-pressure gas and enabling the high-pressure gas to enter into the vortex tube device; the vortex tube device converts the high-pressure gas to cold gas flow and hot gas flow; and the drive device is a hand rocker or a fan blade. The refrigeration and heating device does not dependon energy supply of an environment, and refrigeration and heating effects can be generated in a tent only by manual mechanical drive or by virtue of wind energy; and the refrigeration and heating device has the characteristics of being simple in structure, convenient to carry, and the like, and suitable for being applied to camping in the wild without power supply provision and abundant wind power resources.
Cited by
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TL;DR: In this paper , a novel compressed air energy storage (CAES) system combining vortex tube for combined cooling, heating and power supply is proposed, where the performance of the vortex tube under different working conditions is summarized and the relative error of the modified vortex tube model is less than 1.12%.
9 citations
TL;DR: In this paper , the authors proposed a method for the estimation of the flow behavior inside a vortex tube and provide reliable predictions by dividing the vortex tube flow field into six regions, and corresponding simplifications were made in different regions according to the flow features.
Abstract: • Research idea of dividing the vortex tube flow field into six regions was proposed. • An expression for the axial velocity profile was developed. • The mathematical model for the flow field based on the axial velocity was established. • The flow fields under four different μ c were computed and analyzed. • The reliability of the calculation model was verified through experimental data. The flow pattern and energy transfer process in the vortex tube are extremely complex, resulting in the difficulty of the direct calculation and prediction of the flow structure and temperature separation performance of a vortex tube. In view of this, research idea of dividing the vortex tube flow field into six regions was proposed, corresponding simplifications were made in different regions according to the flow features, and fluid parameters were coupled at the boundaries. An equation for the axial velocity component in the hot tube region was developed based on the characteristic that the axial velocity profiles under different conditions present similar patterns, the calculation method of reverse flow boundary which separates the working fluid into hot and cold fluids was described, and a set of relatively simple calculation methods for the internal flow field of vortex tubes was established based on the partition model. Three-dimensional velocity distributions inside the vortex tube under different working conditions were computed and analyzed. Further, the model was evaluated and validated through experimental data. The results showed good agreements of calculated data and experimental velocity fields. This work proposed a convenient calculation method for the estimation of the flow behavior inside a vortex tube and provide reliable predictions.
7 citations
TL;DR: A vortex tube is a device that uses pressurised inlet gas to split into hot and cold separate streams as mentioned in this paper, which is referred to as energy separation, and is used in many applications.
Abstract: A vortex tube is a device, which uses pressurised inlet gas to split into hot and cold separate streams. This phenomenon is referred to as energy separation. The literature behind the energy separa...
7 citations
TL;DR: In this article , extensive three-dimensional CFD simulations of vortex tube (VT) are conducted with five inert gases, namely helium, neon, argon, nitrogen, and carbon dioxide, to understand the influence of different properties of these gases on the flow phenomena and thermal performance of VT at wide range of cold mass fractions and inlet pressures.
6 citations
TL;DR: In this paper , the authors discuss the computational analysis of vortex tube (VT) with inlet pressure (3-5.5 bar), the number of inlet nozzles as 3, 4, 5, 6 and 7, different turbulence models, and varying cold exit diameter of VT taking air as working fluid on the temperature separation performance.
Abstract: Present work is intended to discuss the computational analysis of vortex tube (VT) with inlet pressure (3–5.5 bar), the number of inlet nozzles as 3, 4, 5, 6 and 7, different turbulence models, and varying cold exit diameter as 4, 5, 6 and 7 mm of VT taking air as working fluid on the temperature separation performance of VT. The simulation is performed with ANSYS17.1 FLUENT software using different turbulence models and validated with the experimental result. It is concluded that the standard k-ε turbulent model shows a promising result than other turbulent models used for the study. The study has been performed on the VT for the same to obtain the optimum cold exit diameter (dc), i.e. 5 mm, best-suited nozzle for VT, and the optimum inlet pressure is 5.5 bar. The results of optimum cold exit diameter show an increment of 10.65% in cooling performance of VT than the previous experimental study. The cold temperature gradient for dc = 5mm is 42.02 K which is the highest among all the cold exit diameters considered.
4 citations