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Heat transfer model of two-phase flow across tube bundle in submerged combustion vaporizer

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Chinese Journal of Chemical Engineering 2019年第3期27卷 613-619页

作者： jiajun song Dongyan Han Qinqin Xu Dan Zhou Jianzhong Yin State Key Laboratory of Fine Chemicals School of Chemical Machinery and SafetyDalian University of Technology

In order to optimize the design of the submerged combustion vaporizer(SCV), an experimental apparatus was set up to investigate the heat transfer character outside the tube bundle in SCV. Several experiments were conducted using water and CO_2 as the heat transfer media in the tubes, respectively. The results indicated that hot air flux, the initial liquid level height and the tube pitch ratio had great influence on the heat transfer coefficient outside the tube bundle(ho). Finally, the air flux associated factor β and height associated factor γ were introduced to propose a new hocorrelation. After verified by experiments using cold water, high pressure CO_2 and liquid N_2 as heat transfer media, respectively, it was found that the biggest deviation between the predicted and the experimental values was less than 25%.

关键词： Submerged combustion vaporizer Fluid sweeping tube bundle Two-phase flow Heat transfer coefficient Modeling

Achieving robust nitritation in a modified continuous-flow reactor: From micro-granule cultivation to nitrite-oxidizing bacteria elimination

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Journal of Environmental Sciences 2023年第2期124卷 117-129页

作者： Wenru Liu jiajun song Jianfang Wang Xiaoming Ji Yaoliang Shen Dianhai Yang National&Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology Suzhou University of Science and TechnologySuzhou 215009China School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China State Key Laboratory of Pollution Control and Resources Reuse Tongji UniversityShanghai 200092China

In this study,a modified continuous-flow nitrifying reactor was successfully operated for rapid cultivation of micro-granules and achieving robust *** showed that sludge granulation with mean size of ca.100μm was achieved within three weeks by gradually increasing settling velocity-based selection pressure from 0.48 to 0.9 m/*** Nitrospira like nitrite-oxidizing bacteria(NOB)were enriched in the micro-granules with a ratio between ammonia-oxidizing bacteria(AOB)and NOB of 5.7%/6.5% on day 21,fast nitritation was achieved within one-week by gradually increasing of influent ammonium concentration(from 50 to 200 mg/L).Maintaining ammonium in-excess was the key for repressing NOB in the ***,when the influent ammonium concentration switched back to 50 mg/L still with the residual ammonium of 15–25 mg/L,the nitrite accumulation efficiency increased from 90%to 98%.Experimental results suggested that the NOB repression was intensified by both oxygen and nitrite unavailability in the inner layers of ***,continuous operation with ammonium in excess resulted in overproduction of extracellular polysaccharides and overgrowth of some bacteria(e.g.,Nitrosomonas,Arenimonas,and Flavobacterium),which deteriorated the micro-granule stability and drove the micro-granules aggregation into larger ones with irregular ***,efficient nitritation was stably maintained with extremely high ammonium oxidation potential(>50 mg/g VSS/hr)and nearly complete washout of NOB was *** suggested that smooth and spherical granule was not a prerequisite for achieving NOB wash-out and maintaining effective nitritation in the granular ***,the microgranules exhibited a great practical potential for high-rate nitritation.

关键词： Continuous flow Granulation Nitritation Nitrate-oxidizing bacteria repression

All-fiber laser seeded femtosecond Yb:KGW solid state regenerative amplifier

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Chinese Physics B 2021年第9期30卷 242-247页

作者： Renchong Lv Hao Teng jiajun song Renzhu Kang Jiangfeng Zhu Zhiyi Wei School of Physics and Optoelectronic Engineering Xidian UniversityXi'an 710071China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China songshan Lake Materials Laboratory Dongguan 523808China

A high efficiency compact Yb:KGW regenerative amplifier using an all-fiber laser seed source was comprehensively *** thermal lensing effect compensated by the cavity design,the compressed pulses with energy of 1 mJ at 1 kHz and 0.4 mJ at 10 kHz in sub-400-fs pulse duration using chirped fiber Bragg grating(CFBG)stretcher were demonstrated.A modified Frantz-Nodvik equation was developed to emulate the dynamic behavior of the regenerative *** simulation results were in good agreement with the *** simulations and experimental results show that the scheme can be scalable to higher energy of multi-mJ,sub-300 fs pulses.

关键词： regenerative amplifier ultrafast laser hybrid laser amplifier

Temporal contrast enhancement by nonlinear elliptical polarization rotation in a multi-pass cell

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High Power Laser Science and Engineering 2022年第5期10卷 14-19页

作者： jiajun song Liya Shen Jianyu Sun Yujie Peng Yuxin Leng State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine Mechanics(SIOM)Chinese Academy of Sciences(CAS)ShanghaiChina School of Physical Science and Technology ShanghaiTech UniversityShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina

We demonstrate the simultaneous temporal contrast improvement and pulse compression of a Yb-doped femtosecond laser via nonlinear elliptical polarization rotation in a solid state multi-pass *** temporal contrast is improved to 109,while the pulse is shortened from 181 to 36 fs,corresponding to a compression factor of *** output beam features excellent beam quality with M^(2) values of 1.18×*** total efficiency of the contrast enhancement system exceeds 50%.This technique will have wide applications in high temporal contrast ultra-intense femtosecond lasers.

关键词： multi-pass cell nonlinear elliptical polarization rotation pulse compression temporal contrast

A 515-nm laser-pumped idler-resonant femtosecond BiB_(3)O_(6) optical parametric oscillator

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Chinese Physics B 2022年第1期31卷 339-343页

作者： Jinfang Yang Zhaohua Wang jiajun song Renchong Lv Xianzhi Wang Jiangfeng Zhu Zhiyi Wei School of Physics and Optoelectronic Engineering Xidian UniversityXi'an 710071China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences(CAS) Beijing 100049China songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800China

We report on an idler-resonant femtosecond optical parametrical oscillator(OPO)based on BiB_(3)O_(6)(BiBO)crystal,synchronously pumped by a frequency-doubled,mode-locked Yb:KGW laser at 515 *** idler wavelengths of OPO can be tuned from 1100 nm to 1540 *** a repetition rate of 75.5 MHz,the OPO generates as much as 400 mW of idler power with 3.1 W of pump power,the corresponding pulse duration is 80 fs,which is 1.04 times of Fourier transform-limited(FTL)pulse duration at 1305 *** addition,the OPO exhibits excellent beam quality with M^(2)<1.8 at 1150 *** the best of our knowledge,this is the first idler-resonant femtosecond OPO pumped by 515 nm.

关键词： nonlinear frequency conversion 515-nm laser pumped femtosecond optical parametric oscillator BiB_(3)O_(6)nonlinear crystal

Diode-pumped 10 W femtosecond Yb:CALGO laser with high beam quality

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High Power Laser Science and Engineering 2021年第2期9卷 257-261页

作者： Jinfang Yang Zhaohua Wang jiajun song Renchong Lv Xianzhi Wang Jiangfeng Zhu Zhiyi Wei School of Physics and Optoelectronic Engineering Xidian UniversityXi’an 710071China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800China University of Chinese Academy of Sciences Beijing 100049China songshan Lake Materials Laboratory Dongguan 523808China

We demonstrate a diode-pumped femtosecond Yb:CaGdAlO_(4)(Yb:CALGO)laser with a semiconductor saturable absorber mirror(SESAM)for stable mode-locking operation.A perfect beam profile is measured under 10 W output power with M_(x)^(2)=1.017 and M_(y)^(2)=1.016 in the horizontal and vertical directions,*** the repetition rate of 71.66 MHz,the optical pulse duration is 247 fs and the pulse energy is 140 nJ at the central wavelength of 1041 nm,corresponding to a peak power of 0.56 *** addition,we also generate continuous wave(CW)power of more than 15 W with TEM00 mode,corresponding to an optical-to-optical efficiency of 44.1%.

关键词： diode pump high power femtosecond oscillator passive mode-locking Yb:CALGO laser

High temporal contrast 1053 nm laser source based on optical parametric amplification and second-harmonic generation

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High Power Laser Science and Engineering 2023年第1期11卷 5-10页

作者： Liya Shen Yanyan Li Wenkai Li jiajun song Junyu Qian Jianyu Sun Renyu Feng Yujie Peng Yuxin Leng State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghaiChina School of Physical Science and Technology ShanghaiTech UniversityShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina

Temporal contrast directly affects the interaction between ultraintense and ultrashort pulse lasers with *** laser sources with broad bandwidth and high temporal contrast are significant for overall temporal contrast *** technique of cascaded nonlinear processes with optical parametric amplification and second-harmonic generation is demonstrated for high temporal contrast seed source *** 40 ps before the main pulse,the temporal contrast reaches over 10^(11).The pulse energy and duration of the high-contrast pulse are 112μJ and 70 fs,*** its high beam quality and stability,this laser source can serve as a high-quality seed for Nd:glass-based ultraintense and ultrashort pulse laser facilities.

关键词： high temporal contrast nonlinear effect optical parametric amplification

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论王俭与“竟陵八友”的形成

上海师范大学学报（哲学社会科学版） 2022年第5期51卷 99-106页

作者：曹旭宋佳俊上海师范大学人文学院上海200234

一般定义,萧衍、沈约、谢朓、王融、萧琛、范云、任昉、陆倕组成的“竟陵八友”,是南齐永明年间由竟陵王萧子良召集形成的文人团体。但其实,“竟陵八友”的雏形,早在王俭身居宰府,掌选职,又兼领国子祭酒时就已经初具规模。后来被王俭拉... 详细信息

一般定义,萧衍、沈约、谢朓、王融、萧琛、范云、任昉、陆倕组成的“竟陵八友”,是南齐永明年间由竟陵王萧子良召集形成的文人团体。但其实,“竟陵八友”的雏形,早在王俭身居宰府,掌选职,又兼领国子祭酒时就已经初具规模。后来被王俭拉拢团结的萧衍、谢朓、任昉、萧琛等人纷纷转入竟陵王府,倒向竟陵王萧子良一边,最终形成“竟陵八友”。这其实是皇权和王俭士族相权的矛盾变得不可调和,齐武帝忌惮王俭势力扩大,扶植二儿子竟陵王萧子良以打压王俭的一台好戏。探究“竟陵八友”的形成,可揭示永明年间皇权一面利用士族、一面又打压士族并取得胜利的历史过程。

关键词：王俭齐武帝萧子良竟陵八友

Numerical investigation and experimental study on hydraulic characteristics of different arrangement plan of setting cover plate along the tunnel bend

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Numerical investigation and experimental study on hydraulic ...