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eiei2011-05-20 10:32:42eieieiei/eeiistp&eia. 180b. 5sciistpeicscdcssci315c. 45eieieiei eieieieiei1884ei19921998eiei eieijaca eieieipageone 2009jacaeieiei villageeiinspecinspecjaca document type: conference article(ca) document type: journal article(ja) eija ei eithe engineering indexei1884engineering information inc.ei11.31.4eieieijacaeieieijaca eieieipageone 2009jacaeieiei villageeiinspecinspecjaca document type: conference article(ca)document type: journal article(ja)eija ei ei1. ei(information abstract)(150 words)(purposes)(procedures)(methods)(results)(conclusions)1) (what i want to do?)2) (how i did it?)3) (what results did i get and what conclusions can i draw?)4) (what is new and original in this paper?) eiei1010 ei7 0 80,1010,ei ei1535001000eiei19921998eiei2009ei scieiistpscieiisiei1) sciei2) ei page onescieiistpisr1512ei/istpeiei1springer100%ei2asme100%ei3asce100%ei4ieee cs99%ei5ieee90%ei6iet90%ei7atlantis press70%1ifacieeeieeeieee51%5002007ieeeicma20072008ieee2wcicaccc3icte4ieee csieeeietasmeasceicicicnc5eiok1ei2icma20072007ieeeieee csieee 1500ieee2ieee ieee500-10003eiieee3lncssci lncseiistpeilncseiei200620072009scilncseieisci3eieiei2321sci/ei/istp2004500-8004ietei906ei50055eiistp3sciieee cs6eiistpieee5istp4eiei2003icnnspieteiistpasceeiistpasme3eiistp6789 hls85915 (ta) cnkieieiei-village2 /search forsearch insan-feng zhang, zhang sanfeng, s.-f zhangsearch resultsdetailedaccession numberheat transfer of water at supercritical pressures in vertically-upward internally-ribbed tubeswang jian-guo,et al.accession number20091311983095ei ei2012the engineering index ei1884(engineering informationinc.)ei11.31. 4ei153500100016eieieiei2-62-3ei eiei1.ei 2.! ei2ei page one page one eiei/controller/servlet/controller1eiei2eisearch forsearch intitlesearcheithe structure optimization of the siphonic bedpans flow channel based on thenumerical simulation technologyge zhenghao, wang jinshui,su penggang , liang jiangboshaanxi university of science & technology, xian, shaanxi, 710021, chinaabstractaccording to siphonic bedpans work principle, siphonic bedpan with variational section flow channel is put forwards into application in this paper. structure design optimization of siphonic bedpans flow channel is discussed. based on making use of pro/e to conduct the parametrization modeling of the siphonic bedpan (the constant section bedpan and the variational section bedpan), and then adopt adina to simulate the flow field in the siphonic bedpan with not taking the filth into consideration. the calculation results of the numerical simulation demonstrate that variational section bedpan is better than the constant section bedpan in flushing and saving water. the results indicates the adoption of adina software to carry out sanitary implements numerical simulation can improve the accuracy of the bedpan design and manufacturing consumedly, provides a theories analysis foundation for the engineering, design and application of bedpan.keywords-siphonic bedpan;flowchannelstructure;numerical simulationi. introductionflushing function requirement of sanitaryimplementlosing energy. siphonic bedpan?s flush power primarily relies on siphonic power.iii. the structure design of siphonic bedpan?sflow channel as mentioned above, under the condition of piping water-filled, whatever means we adopt, it will not produce the siphonic phenomenon if air is interfused. so we should make sure that the piping section dimension is appropriate, as figure 1 shows, the diameter of d-e segment is degressive. according to the statics and hydromechanics theories, while the fluid in piping flows stably, the physical volume flux is constant at any section of the pipe. so the smaller of the pipe section, the higher of the current velocity of the fluid. so the diameter change could result in the watervelocity change in the d-e segment.figure 1. the structure design of siphonic bedpan?s flow channeliv. three-dimensional steady numericsimulation for flowing in bedpanthen the model is imported into adina8.3 through iges data format. in adina, we still need to predigest the physics model before adding load and boundary conditions. detailed information is as follows:load: velocity (the water warp?s entry velocity is 1.5 m/s),pressure (pressure in piping exit), and in addition,special boundary condition is wall. the material is water, and its density is 1.0103 kg/m3,viscosity is 1.00310-3 kg/(ms).in adina, tetrahedral grid is adopted, and the model is meshed according to appointed unit length being 2 mm to the sections with same diameter. to the constant section bedpan, total meshing grid node amount is 3378, meshing grid unit amount is 15497, and to the variational section bedpan, meshing grid node amount is 2968, meshing grid unit amount is 13818. appointed time step is 100, constant magnitude is 0.1 s, the calculation results are showed as thefigure 2 and 3.figure 2. pressure distributing for the constant section bedpanfigure 3. pressure distributing for the variational section bedpanv.the vof analysis on siphonic bedpan?sflushing processa. the vof methodaw?aa?1among above, ?a? denotes the volume fraction, subscript ?w? and ?a? denote water and air respectively. once the water and air?s volume fractions are known, all their unknown quantity and characteristic parameter can be denoted by average volume fraction. tracking the water-air interface can be solved by nether consecutive equation.?aw?t?v?aw?0thereinto, ?v? denotes velocity vector.b. boundary conditionsthe material property and the boundary conditions are as follows: gas phase is air, and its density is 1.293 kg/m3, viscosity is 1.789410-5 kg/(ms). liquid phase is water, its density is 1.0103 kg/m3, viscosity is 1.00310-3 kg/(ms). the work pressure is 101325 pa. gravitational acceleration is -9.8 m/s2, work density choose the lighter phase?s, to obviate water static pressure calculation in the lighter phase, it need to improve the precision of momentum balance calculation.c. the result for bedpans vof analysisthe figure 4 shows flowing field distributions at differentmoment.figure 4. distributing of flow at different moment by simulation for thevariational section bedpanthe figure 5 shows pressure distribution at different moment for the variational section bedpan. in the following figures, to the constant section bedpan, the minus pressure is -695.4 pa, while to the variational section bedpan, the minus pressure is -1733 pa, this difference shows the strong function of siphon.figure 5. pressure distributing at different moment for the variationalsection bedpan3) velocity distributionbedpan can easily achieve the function of saving water.figure 6. the velocity distribution of the two kind sections bedpan pipevi. conclusionsthis paper studied on the structure optimization of the siphonic bedpan?s flow channel, recurring to finite element software adina, three-dimensional steady flow numeric simulation of water flowing in bedpan is carried out, the vof analysis on siphonic bedpan?s flushing process has also been carried out. the results can help technics designers find out the disfigurement essentially, enhance the precision inthe porcelain sanitation field. further more, it will shorten the exploiting time and expense of the new product consumedly, bring remarkable economic benefit to producing enterprise.acknowledgmentamerica the preferred spelling is without an e of the word acknowledgment in after the g. avoid the stilted expression, one of us (r.b.g.) thanks . . . instead, try r.b.g. thanks. put applicable sponsor acknowledgments here; do not place them on the first page of your paper or as a footnote.references1 yue bangguo, talking about bedpan?s flushing filth function andsaving water, chinaware, 2001(5).(in chinese)t