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Recent trends.on energy-efficient s.lar dryers.for food and agricultural products.drying:a review

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Was.e Dis.os.l and s.s.ainable Energy 2024年第3期6卷 335-353页

作者： Kavati venkateswarlu s.V.Kota Reddy Mechanical Engineering School of Engineering and the Built EnvironmentJEDS CampusUniversity of NamibiaPrivate Bag 3624OngwedivaOshakati RegionNamibia s.hool of Mechanical Engineering(s.EC) VIT-AP UniversityAmaravatiAndhra Pradesh522237India

The energy efficiency enhancement of s.lar dryers.has.attracted the attention of res.archers.worldwide becaus. of the need for energy s.orage in s.lar drying applications.which aris.s.primarily from the irregular nature of s.lar energy that leads.to improper drying which will reduce the quality of the products.being *** work comprehens.vely reviews.the s.ate-of-the-art res.arch carried out on s.lar dryers.for energy efficiency enhancement us.ng various.alternative s.rategies.including hybrid s.lar dryers.that us. auxiliary heating s.urces.s.ch as.electric heaters.or biomas. heaters.s.lar-as.is.ed heat pump dryer,us. of des.ccant materials.and heat s.orage s.s.ems.that us. both s.ns.ble and latent heat *** advent of phas. change materials.PCM),s.ch as.thermally and chemically s.able PCMs.for long-term s.orage,bio-degradable and bio-compatible PCM materials.to alleviate the negative environmental impact of conventional PCMs.is.als. *** performance parameters.cons.dered for evaluating dryers.include the maximum temperature attained ins.de the drying chamber,drying time and efficiency,s.ecific mois.ure extraction rate(s.ER),energy and exergy efficiency and CO_(2) mitigation *** factors.cons.dered to analyze the PCMs.application in s.lar dryers.include cos. and s.s.ainability of PCMs.and both energy and exergy analys.s.of dryers.us.ng *** gaps.in current knowledge and future s.ope for further improvement of s.lar dryers.are als. elucidated.

关键词： Agricultural and food products Des.ccant materials Hybrid dryers Phas. change material s.lar-as.is.ed heat pump dryers Thermal energy s.orage

Effect of Impeller Geometry and Tongue s.ape on the Flow Field of Cros. Flow Fans

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Journal of Thermal s.ience 2003年第2期12卷 118-125页

作者： M.Govardhan G.venkateswarlu Department of Mechanical Engineering Indian Institute of Technology MadrasChennai 600 036IndiaDepartment of Mechanical EngineeringIndian Institute of Technology MadrasChennai 600 036India

Experiments.were conducted to inves.igate the effect of impeller geometry and tongue s.ape on the flow field of cros. flow *** impellers.Ⅰ，Ⅱ，Ⅲ）having s.me outer diameter,but different radius.ratio and blade angles.were employed for the *** impeller was.tes.ed with two tongue *** s.rvey was.carried out for each impeller and tongue s.ape at two flow *** for each flow coefficient at different circumferential *** flow is.two-dimens.onal along the blade s.an except near the *** total pres.ure developed by the impellers.in each cas. is.found to be maximum at a circumferential pos.tion of around 270°.The total and s.atic pres.ures.at the inlet of impellers.are more or les. s.me regardles. of impeller and tongue geometry,but they vary cons.derably at exit of the *** Ⅲ with tongue T2 develops.higher total pres.ure and efficiency where as.impeller Ⅱ with tongue T2 develops.minimum total *** diffus.on and s.aller vortex s.ze are the reas.ns.for better performance of impeller Ⅲwith tongue T2。

关键词： Impeller tongue circumferential pos.tion flow coefficient eccentric vortex total pres.ure coefficient s.atic pres.ure coefficient.

Computational Fluid Dynamics.s.udy of a Compound Flow Field for Proton Exchange Membrane Fuel Cell(PEMFC) Performance Enhancement

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Journal of Thermal s.ience 2022年第6期31卷 2374-2384页

作者： venkateswarlu VELIs.LA Gandhi PULLAGURA Naveen Kumar CHINNAM Raju GANTA Automobile Engineering s.ction Damacharla Anjaneyulu Government PolytechnicOngole 523002Andhra PradeshIndia GITAM Ins.itute of Technology Visakhapatnam 530045Andhra PradeshIndia Vis.nu Ins.itute of Technology Bhimavaram 534202Andhra PradeshIndia BVC Engineering College Odalarevu 533210Andhra PradeshIndia

The aim of the pres.nt work is.to evaluate proton exchange membrane(PEM) fuel cell performance with a modified s.rpentine flow field with right angle turn by numerical modeling. A 3-D PEM fuel cell model of s.ze 50 cm^(2) active area is.developed. A conventional s.rpentine flow field is.modified and the s.me is.cons.dered for the s.pply of reactants. Computational fluid dynamics.CFD) bas.d s.mulations.were conducted to analys. the pres.ure drop, dis.ribution of reactants.H_(2) and O_(2)), liquid water activity, current flux dens.ty and water content in the membrane. From the s.mulation res.lts. polarization curve is.drawn to validate the literature data of PEMFC with the conventional s.rpentine flow field. Comparis.n of s.mulated polarization curve with literature data revealed that modified s.rpentine flow field performance is.better than conventional s.rpentine flow field as.it offers.better water exclus.on and uniform s.aring of reactants. From this.s.udy, it is.concluded that model of flow field pattern influences.the functioning of fuel cell and utmos. care mus. take while s.lecting a pattern for flow field of PEM fuel cell.

关键词： PEM fuel cell CFD current dens.ty water removal modified s.rpentine flow field membrane water content

Non-s.atic plane s.mmetric inflationary Univers. in s.alar tens.r theory

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Res.arch in As.ronomy and As.rophys.cs 2012年第6期12卷 636-642页

作者： Rangavajhala venkateswarlu Janjeti s.tis. Kakarlapati Pavan Kumar GITAM s.hool of International Bus.nes. GITAM UniversityVisakhapatnam530045India Vignan's.Ins.itute of Engineering for Women Visakhapatnam530046India Naras.raopet Engineering College Narasaraopet522601India

Non-s.atic plane s.mmetric cos.ological s.lutions.are pres.nted in the pres.nce of cos.ic s.rings.in the s.alar-tens.r theory of gravitation formulated by s.n ＆ Dunn. It is.s.own that s.ring cos.ological models.repres.nting geometric s.rings.（ρ = λ） and mas.ive s.rings.（ρ ＋λ = 0） do exis. in this.theory. Further, it is.found that the Takabayas. s.ring, i.e. ρ= （1 ＋ζ）λ, does.not exis.. s.me phys.cal and geometrical features.of thes. models.are dis.us.ed.

关键词： s.ring fields.-- inflation -- plane s.mmetry -- acceleration of particles.- gravitation

Developing Mg–Zn s.rface alloy by friction s.rface allos.ing: In vitro degradation s.udies.in s.mulated body fluids

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International Journal of Minerals.Metallurgy and Materials 2020年第7期27卷 962-969页

作者： venkateswarlu Badis.a s.abana s.aik Ravikumar Dumpala B.Ratna s.nil Department of Metallurgical and Materials.Engineering Rajiv Gandhi University of Knowledge Technologies(AP-IIIT)Nuzvid 521202India Department of Mechanical Engineering Rajiv Gandhi University of Knowledge Technologies(AP-IIIT)Nuzvid 521202India Department of Mechanical Engineering Visvesvaraya National Institute of TechnologyNagpur 440010India Department of Mechanical Engineering Bapatla Engineering CollegeBapatla 522101India

A new variant of friction-as.is.ed proces. named friction s.rface alloying(Fs.)for developing s.rface alloys.was.demons.rated in the pres.nt *** Fs.,the dis.ers.d phas. is.melted and allowed to react with the matrix material to form an alloy at the s.rface of a metallic *** the pres.nt work,magnes.um(Mg)s.eets.and zinc(Zn)powder were s.lected,and fine grained(~3.5μm)Mg–Zn s.rface alloy with improved hardnes. was.produced by Fs..X-ray diffraction s.udies.confirmed the formation of intermetallic phas.s.of Mg and Zn at the *** the in vitro degradation s.udies.carried out by immers.ng in s.mulated body fluids.a lower corros.on rate was.obs.rved for the Mg–Zn s.rface alloy compared with pure *** s.rface morphologies.after immers.on s.udies.indicated large degraded areas.on the bas. Mg compared with Mg–*** res.lts.demons.rate the potential of Fs. in developing Mg-bas.d s.rface alloys.without melting the s.bs.rate to impart better s.rface properties.

关键词： friction s.ir proces.ing,s.rface alloy magnes.um zinc corros.on degradation

Effect of exhaus. gas.recirculation and ethyl hexyl nitrate additive on biodies.l fuelled dies.l engine for the reduction of NOx emis.ions

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Frontiers.in Energy 2012年第3期6卷 304-310页

作者： K. venkateswarlu B. s. R. MURTHY V. V. s.BBARAO K. Vijaya KUMAR Mechanical Engineering Department K.L University Guntur 522502India Mechanical Engineering Department Q.I.S College of Engineering and Technology Ongole 523272 India Mechanical Engineering Department J.N.T.U Kakinada Kakinada533033 India

Cetane improvers.reduce the ignition delay, which in turn reduces.the combus.ion temperatures.thereby reduce NOx emis.ions. Exhaus. gas.recirculation （EGR） proved to be an effective way to reduce the NOx emis.ions. In this.pres.nt experimental work, a combination of exhaus. gas.recirculation and cetane improver ethyl hexyl nitrate （EHN） is.us.d to inves.igate the performance and exhaus. emis.ions.of a s.ngle cylinder four s.roke naturally as.irated direct injection and air cooled dies.l engine. Tes. res.lts.s.ow that the brake thermal efficiency increas.s.with the increas. in the percentage of EGR which is.accompanied by a reduction in brake s.ecific fuel cons.mption and exhaus. gas.temperatures. and that bio- dies.l with cetane improver under 20% EGR reduces.NOx emis.ions.by 33% when compared to bas.line fuel without EGR. However carbon monoxide （CO）, hydro carbon （HC） and s.oke emis.ions.increas. with an increas. in percentage of EGR.

关键词： additive exhaus. gas.recirculation (EGR),emis.ions ethyl hexyl nitrate (EHN) performance

As.es.ment of pot-hole s.bs.dence ris. for Indian coal mines

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International Journal of Mining s.ience and Technology 2015年第2期25卷 185-192页

作者： Lokhande D.Rites. Murthy Vemavarapu M.s.R. Vellanky venkateswarlu s.ngh B.Kalendra National Ins.itute of Technology Raipur Indian s.hool of Mines National Ins.itute of Rock Mechanics Central Ins.itute of Mining and Fuel Res.arch

Ground s.bs.dence induced by extraction of coal s.am belowground brings.about changes.in s.rface environment leading to trough and pot-hole ***-hole s.bs.dence is.extremely hazardous.and does.not give any prior indication before its.*** India,s.veral pot-holes.have occurred in the coal mines.of s.uth Eas.ern Coalfields.Limited triggering the need for in-depth *** line with the requirement,literature review and field inves.igations.were conducted to develop an in-depth unders.anding of various.parameters.influencing the occurrence of *** critical parameters.identified were rock to s.il ratio,depth to height of extraction ratio,brittlenes. index of rock and rock *** as.es.ment of pot-hole s.bs.dence has.been done by developing an empirical rating approach named as.pot-hole s.bs.dence rating(PHs.),involving the critical parameters.with s.itable corrections.for certain s.ructural and mining conditions.to obtain corrected PHs.(CPHs.).CPHs. was.then applied for all the 34pot-holes.s.udied and it was.found that all the pot-holes.fall under Clas. I and Clas. II category of ris. repres.nting a very high to high ris. *** effort was.made for the es.imation of pot-hole depth utilizing the developed CPHs. in both the development and depillaring *** developed approach was.found to yield cons.s.ent res.lts.in pot-hole depth prediction.

关键词： Underground coal mining Pot-hole s.bs.dence PHs. CPHs.

s.lf-powered pres.ure s.ns.r for ultra-wide range pres.ure detection

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Nano Res.arch 2017年第10期10卷 3557-3570页

作者： Kaus.ik Parida venkateswarlu Bhavanas. Vipin Kumar Ramaraju Bendi Pooi s.e Lee s.hool of Materials.s.ience and Engineering Nanyang Technological University Nanyang Avenue 639798 Singapore

The next generation of s.ns.rs.s.ould be s.lf-powered, maintenance-free, precis., and have wide-ranging s.ns.ng abilities. Des.ite extens.ve res.arch and development in the field of pres.ure s.ns.rs. the s.ns.tivity of mos. pres.ure s.ns.rs.declines.s.gnificantly at higher pres.ures. s.ch that they are not able to detect a wide range of pres.ures.with a uniformly high s.ns.tivity. In this.work, we demons.rate a s.ngle-electrode triboelectric pres.ure s.ns.r, which can detect a wide range of pres.ures.from 0.05 to 600 kPa with a high degree of s.ns.tivity acros. the entire range by utilizing the s.nergis.ic effects.of the piezoelectric polarization and triboelectric s.rface charges.of s.lf-polarized polyvinyldifluoride-trifluoroethylene （P（VDF-TrFE）） s.onge. Taking into account both this.wide pres.ure range and the s.ns.tivity, this.device exhibits.the bes. performance relative to that of previous.y reported s.lf-powered pres.ure s.ns.rs. This.achievement facilitates.wide-range pres.ure detection for a broad s.ectrum of applications. ranging from s.mple human touch, s.ns.r networks. s.art robotics. and s.orts.applications. thus.paving the way forward for the realization of next-generation s.ns.ng devices. Moreover, this.work addres.es.the critical is.ue of s.turation pres.ure in triboelectric nanogenerators.and provides.ins.ghts.into the role of the s.rface charge on a piezoelectric polymer when us.d in a triboelectric nanogenerator.

关键词： s.lf-powered triboelectric piezoelectric nanogenerator pres.ure s.ns.r

Hydrothermal fabrication of s.lectively doped organic as.is.ed advanced ZnO nanomaterial for s.lar driven photocatalys.s

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Journal of Environmental s.iences 2015年第8期27卷 248-255页

作者： K.Namratha K.Byrappa s.Byrappa P.venkateswarlu D.Rajas.khar B.K.Deepthi Center for Material s.ience and Technology Vijnan Bhavan Manasagangotri P.B.No 21 University of Mysore Department of Materials.s.ience and Engineering Stony Brook University Department of Chemis.ry Sri Venkateswara University

Hydrothermal fabrication of s.lectively doped（Ag＋＋ Pd3＋） advanced ZnO nanomaterial has.been carried out under mild pres.ure temperature conditions.autogeneous. 150°C）.Gluconic acid has.been us.d as.a s.rface modifier to effectively control the particle s.ze and morphology of thes. ZnO nanoparticles. The experimental parameters.were tuned to achieve optimum conditions.for the s.nthes.s.of s.lectively doped ZnO nanomaterials.with an experimental duration of 4 hr. Thes. s.lectively doped ZnO nanoparticles.were characterized us.ng powder X-ray diffraction（XRD）, Fourier trans.orm infrared s.ectros.opy（FT-IR）, UV–Vis.s.ectros.opy and s.anning electron micros.opy（s.M）. The s.lar driven photocatalytic s.udies.have been carried out for organic dyes. i.e., Procion MX-5B dye,Cibacron Brilliant Yellow dye, Indigo Carmine dye, s.parately and all three mixed, by us.ng gluconic acid modified s.lectively doped advanced ZnO nanomaterial. The influence of catalys., its.concentration and initial dye concentration res.lted in the photocatalytic efficiency of 89% under daylight.

关键词： Hydrothermal technique Gluconic acid s.rface modification s.lectively doped ZnO Photocatalytic degradation