Heat transfer characteristics of a small heated device have been investigated in a liquid bath with gas jetimpingement as function of gas flow rate,coolant temperature,liquid phsicochemical properties,heat flux,heat source size,ambient pressure and the distance between jet and heated wall.The experimental results show that the agitation of liquid caused by gas jet bubbles increases greatly therate of heat transfer,and the evaporation of coolant near the wall,which was due to the concentration differencebetween gas-liquid interface and bulk gas phase,gives additional enhancement of heat transfer.The rate ofevaporation related to the bubble growth was mathematically formulated.By using the simultaneous heat and mass transfer model,the convective heat transfer coefficient and masstransfer coefficient can be deduced from the experimental results.In addition,the local heat transfer coefficient and the distribution of evaporation heat flux on the smallheated surface are investigated mathematically and experimentally.

The behaviour of water soluble and monomer soluble inhibitors in emulsion polymerization of monomersfollowing Case Ⅱkinetics(e.g.styrene)has been investigated.Experimental studies reveal that inhibitors canhave an appreciable effect on both polymer particle nucleation and growth.A mathematical model showingthese effects has been developed and simulation studies have been done.The simulation results imply that theconsequences of these effects of monomer soluble inhibitors for industrial emulsion polymerization may be quiteserious.

The behaviour of water soluble and monomer soluble inhibitors in the emulsion polymerization for CaseI system(e.g.vinyl acetate and vinyl chloride)has been studied.The behaviour of monomer soluble inhibitorsis shown to be quite different from that observed in Case Ⅱemulsion polymerization system.Model predictionsof the effect of these inhibitors on polymer particle nucleation and growth rate are shown to be in satisfactoryagreement with experimental results.

Hydrodynamic characteristics of rotating perforated disk contactor(RPDC)were studied with emulsionwater system.The emulsion was dispcrsed in water and its holdup was measured.The effects of columndimensions and operating conditions on holdup and characteristic velocity were studied.By using the methodof dimensional analysis,the authors obtained two experimental correlations for estimating holdup and characteristic velocity respectively.Drop size distribution was studied photographically.The experimental results showedthat drop size distribuiion could be described by upper-limit log-normal distribution.

A unified model for predicting high-pressure viscosities of both hydrocarbon gases and liquids was developed,which is based on the similarity between P-V-T and T-μ-P plots and Patel-Teja equation of state.The characteristic feature of this new model is its capability of describing the continuous variation of fluid viscosity throughciritical region.The pure component parameters are generalized into functions of reduced temperature,reducedpressure,acentric factor and molecular weight.The overall average absolute deviation of predicted viscositiesof 20 pure hydrocarbon fluids(a total of 1941 data points)is 8.7%.

Kinetics of the steam reformig of n-butane,n-hexane,n-heptane,n-nonane and i-octane on Z409 catalystwere studied at atmospheric pressure by using an internal recycle gradientless reactor.The reaction temperaturewas varied in the range of 743-853K,the steam carbon molar ratio 3-5.The experimental results showed thatthe reforming products contained no hydrocarbon other than methane.In addition,the product distributionof different n-paraffins were similar,but the product distribution of i-octane was different from that of n-paraffins.A reaction scheme for the steam reforming of paraffin has been proposed and the hyperbolic type rateequations were derived.It is clear that the obtained kinetic model could simulate the experimental results ofi-octane as well as different n-paraffins satisfactorily.

The adsorption kinetics and equilibrium of H_2PtCl_6 on various types of alumina were studied,and IRSand DRS were used to characterize these supports before and after impregnating with H_2PtCl_6 solution.Thedata indicated that the uptake of H_2PtCl_6 on supports strongly depends on the Lewis acidity of alumina andthat the adsorption rate is controlled by pore diffusion for supports of high adsorption capacity.Relationshipbetween uptake and acidity is interpreted in terms of active hydroxyl groups on alumina.

The new method named as LEACHEX process which combines leaching of minearl and extraction of metalfrom leaching liquor is used to proccss scheelite concentrate.Elimination of solid film consisting of tungstic acidand the controlling step of chemical reaction are illustrated and an empirical kinetic equation is proposed basedon unreacted-shrinking-core model.90 percent decomposition of scheelite can be attained in 1800 seconds.

Experiments on bed-to-surface heat transfer in the axial and radial directions were carried out in a cold flowmodel of the circulating fluidized bed of 244mm i.d.and with FCC catalysts(d_p=83.4μm)as the fluidized particles.A simplified gas-solid flow model comprising of the cluster-particulate phases upflowing cocurrentlywas proposed.By taking into account the alternative contacts of cluster and particulate phases with the immersedsurface,a composite heat transfer model was developed.The model gave good predictions as compared withthe experimental results of this work and those of others.

A new group-contribution equation of state(VDW-GC EOS)is developed by applying the group-contributionconcept to a local composition version of the modified van der Waals equation of state(VDW-DDLC EOS),which is established by combining the density dependent local composition mixing rule with the modified vander Waals equation of state.Group interaction parameter matrix for thirteen groups were determined frombinary VLE data.The new VDW-GC EOS has been extensively tested on the prediction of vapor-liquid,liquidliquid and gas-solid equilibria.In part Ⅰthe mathematical formulation of the VDW-GC EOS and the determination of the group interaction parameters are discussed.

The VDW-GC equation of state developed in PartⅠhas been extensively tested on the prediction of binaryand multicomponent vapor-liquid equilibria of polar and nonpolar mixtures.Comparison with other twogroup-contribution equations of state showed that VDW-GC,in general,can give slightly better predictions forhigh-pressure systems.

Mixing/Segregation of an iron-and-sand mixture was investigated in a 38 mm diameter moving fluidizedbed with feed into the middle of the bed and exit from both the top and the bottom.The distribution ofvolumetric concentration of iron beads,measured by means of a specially designed sampler,was used to expressthe degree of segregation of the particle mixture in the bed.The segregation index N,defined as the ratio betweenS and Z.X_v,decreases with increase in superficial gas velocity and solids flow rate,for any given solidsdensity ratio and particle size ratio.When a magnetic field was employed,particle segregation was noted toincrease with magnetic field strength.