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Zhang Z.,Beijing University of Chemical Technology | Yang W.,Beijing University of Chemical Technology | Guan C.,Beijing University of Chemical Technology | Ding Y.,Beijing University of Chemical Technology | And 2 more authors.
Experimental Thermal and Fluid Science | Year: 2012

The paper reported thermohydraulic characteristics of turbulent flow in the circular smooth tubes equipped with rotor-assembled strands of different diameters and leads with Reynolds number ranging from 20,000 to 75,000. An experiment using a smooth tube was done to calibrate the experimental system and data reduction method. The effects of the rotor diameter and lead on the heat transfer augmentation, friction factor and PEC value have been presented respectively. The obtained results of inserted tube revealed that rotor-assembled strand significantly improved heat transfer with the Nusselt number increased by 91.4-178.7% and friction factor increased by 158.5-295.9% within the experimental Reynolds number range. The comparisons of different rotor-assembled strands inserted tubes and plain tube showed that the heat transfer benefited from the growing diameter and decreasing lead of rotor-assembled strands, the friction factor increased with the increasing diameter and the decreasing lead of rotor-assembled strands, and PEC value increased with an increase of rotor diameter and lead. Based on thorough multivariate linear normal regression method, the correlations of average Nusselt number, friction factor and PEC value are presented. © 2011 Elsevier Inc.


Liu J.Q.,CAS Institute of Geology and Geophysics | Li Z.,CAS Institute of Geology and Geophysics | Huang J.C.,State Intellectual Property Office of China | Yang L.,CAS Institute of Geology and Geophysics
Science China Earth Sciences | Year: 2012

The Upper Ordovician Lianglitag Formation carbonate rocks are important oil and gas reservoirs in the Tarim Basin, Northwest China, with obviously distinct reservoir properties among different oilfields. As a case area of the above carbonate reservoirs correlation, Tahe and Tazhong oilfields are chosen for the study through an integrated analysis of biostratigraphic isochronous framework, cores, thin sections, logs, and strontium isotopes. The research shows that the two areas were respectively attributed to different carbonate platforms during the Lianglitag Formation depositional phase. For the Lianglitag Formation, five fourth-order sequences may be divided in Tazhong, whereas only four fourth-order sequences are preserved in Tahe that correspond to the lower ones observed in Tazhong. The Lianglitag Formation carbonate platform in Tahe was characterized by ramp and/or weak rimmed types, with low depositional rates (37 μm/a), higher whole-rock clastic contents, and higher 87Sr/ 86Sr isotope ratios of carbonate matrix, showing relatively deep-water environment and evident terrigenous input for carbonate deposition. However, a strongly rimmed carbonate platform was developed in Tazhong, with high depositional rates of 250 μm/a and less whole-rock clastic contents, indicating a high-energy depositional environment. Because of the sedimentary environment differences mentioned above, less high-energy facies but relatively intense syndepositional (early diagenetic) sea-water cementation of carbonates were developed in Tahe, and ubiquitous high-energy reef and shoal facies, with a frequent exposure to subaerial, and weak syndepositional sea-water cementation of carbonates in Tazhong. Therefore, fewer primary pores occurred in the Lianglitag Formation carbonate rocks of Tahe, whereas more primary pores were preserved in the same lithostratigraphic unit of the Tazhong (No. 1 fault zone). Available high-energy reef-shoal facies and early diagenesis, with more primary pores preserved, provided a key material basis for the Lianglitag Formation carbonate reservoirs that largely occurred in Tazhong. © 2012 Science China Press and Springer-Verlag Berlin Heidelberg.


Han C.,Beijing University of Chemical Technology | Peng W.,Beijing University of Chemical Technology | Yang W.,Beijing University of Chemical Technology | Zhang Z.,Beijing University of Chemical Technology | And 4 more authors.
ICMREE 2013 - Proceedings: 2013 International Conference on Materials for Renewable Energy and Environment | Year: 2013

The heat transfer enhancement of grooved lobe rotors and smooth tube were investigated in the integrated heat transfer performance test bench of shell-and-tube heat exchanger. The results indicated that heat transfer rate of tube with the grooved lobe rotors increased about 80-120% compared with that of smooth tube, but the coefficients of resistance also increased about 65-75%. It would be necessary to modify the structure of grooved lobe rotors in the future in order to obtain high heat transfer coefficient and a relatively low friction factor. © 2013 IEEE.


Wang J.,State Intellectual Property Office of China | Wang R.,Shandong University
Key Engineering Materials | Year: 2013

A new liquid redox method for low sulfur containing gas treatment, with H2S concentration less than 1000mg/m3, was developed employing the heteropoly compounds of molybdenum and phosphorus by the present authors. The desulfurization characteristics of the absorbent system of vanadium substituted heteropoly acid, viz. H4PVMo11O40, were investigated by dynamic outlet-gas H2S concentration detection method. Like the aqueous solution of the parent compound, namely H 3PMo12O40 or its sodium salt, H 4PVMo11O40 solution can also be used as efficient absorbent for H2S removal. The absorbent system of H 4PVMo11O40 solution was found to have fairly good absorption-regeneration performance, with a H2S removal rate of up to 100% in the presence of CuS as additive, hence it is promising in pollution control and resource reclamation. © (2013) Trans Tech Publications, Switzerland.


Han C.,Beijing University of Chemical Technology | Yang W.,Beijing University of Chemical Technology | Ding Y.,Beijing University of Chemical Technology | Guan C.,Beijing University of Chemical Technology | And 3 more authors.
Chinese Journal of Chemical Engineering | Year: 2011

The paper described experimental investigation of heat transfer and single-phase pressure drop through tubes with different rotor-assembled strands inserted in the Reynolds number range of 800-9000 with lubricant as working fluid. In the experiment, fixed mounts were employed to eliminate the entrance effect. The experimental results showed that the employment of fixed mounts led to a visible bias of friction factor in the laminar regime while it could not affect the Nusselt numbers significantly. Experiment for the tube inserted with rotors-assembled strand showed remarkable improvement for heat transfer with the Nusselt number increased by 200-225 in the laminar regime and 125-160 in the transitional regime. Meanwhile, the friction factor increased inevitably by 200-300 within the same range of Reynolds number. The comparison of different rotor-assembled strands inserted tubes and plain tube showed that the heat transfer benefited from the increase of the diameter of rotor-assembled strand with the same lead and the decrease of the lead of rotor-assembled strand, so does the friction factor. Based on experimental data and thorough multivariant linear normal regression method, the correlations of average Nusselt number and friction factor are established. © 2011 Chemical Industry and Engineering Society of China (CIESC) and Chemical Industry Press (CIP).

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