If A method of studying the design variables pertinent to agitated gas-liquid reactors has been developed; the catalyzed rate of air oxidation of aqueous sodium sulfite and the agitator power consumption are measured. Volumetric absorption coefficients for agitated contactors are shown to vary with (agitator power)0•95 and with (gas velocity)0•67, giving rise to a new function, absorption number, defined as /Cy/V,0•67, where KY is the absorption coefficient and Vs is the average gas velocity based on the cross section of the reactor. When plotted against,agitator power input per unit volume of liquid, this function is shown to correlate data for vaned-disk impellers and flat paddles covering, respectively, threeand tenfold variations of scale size,• it thus becomes a satisfactory basis for the design of plant equipment. Power magnitudes ranging from 10 to 3000 ft.-lb./(min.Xcu.ft.) and gas rates ranging from 20 to 360 feet/hour are reported. Application of this correlation to the study of design variables is illustrated by data relating the performance of a laboratory reactor to liquid depth. A no-gas power correlation of the familiar power function-Reynolds number type is presented for the vaned disk operating in a baffled tank. FOR absorption applications to which conventional plate or packed columns are not well suited, such as gas-liquid reac-65
The discovery of advanced thermoelectric materials is the key bottleneck limiting the commercialization of solid-state technology for waste heat recovery and compression-free refrigeration. Computationally-driven approaches can accelerate the discovery of new thermoelectric materials and provide insights into the underlying structure-property relations that govern thermoelectric performance. We present TE Design Lab (www.tedesignlab.org), a thermoelectrics-focused virtual laboratory that contains calculated thermoelectric properties as well as performance rankings based on a metric [29] that combines ab-initio calculations and modeled electron and phonon transport to offer a reliable assessment of the intrinsic material properties that govern the thermoelectric figure of merit zT . Another useful component of TE Design Lab is the suite of interactive web-based tools that enable users to mine the raw data and unearth new structure-property relations. Examples that illustrate this utility are presented. With the goal of establishing a close partnership between experiments and computations, TE Design Lab also offers resources to analyze raw experimental thermoelectric data and contribute them to the open access database.
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