Wall factor for acceleration and terminal velocity of falling spheres at high reynolds numbers

The wall factor for spheres in the acceleration and terminal velocity ranges was determined experimentally for very high Reynolds numbers (13 500 < Re < 70 000). Experiments were performed with 12, 15, 18, 21, 25 and 31.75 mm spheres, falling in water inside cylinders 3.4, 4.9, 7, 10, 14 and 19 cm in diameter. A published empirical equation was found to yield good results for the terminal velocity wall factor in the range of studied Reynolds numbers.     

An empirical examination of the determinants of honey consumption in Romania

While not much attention has been paid in the international literature to the consumption of premium food products with enhanced quality properties in Central‐Eastern European Countries (CEECs), the present survey aims to investigate consumer behaviour in Romania as regards ‘honey’ as an example of such a product. The research concludes that, despite the changes in eating habits induced by changes in the retail environment, honey remains a popular product, the purchase of which in bulk from producers and in open markets is still the dominant trend. The survey further identifies four main dimensions of honey‐purchasing motivation: medical benefits of its consumption, dietary quality, ethical character of honey and suitability with food consumption lifestyle. Using these dimensions validated by factor analysis, three clusters of honey consumers in Romania emerged through cluster analysis: the common consumers, the younger consumers indifferent towards honey and the enthusiastic consumers, who are also more willing to pay premium prices for the organic type of honey. If the first segment may be the keenest on competitive prices, quality differentiation strategies can target the enthusiastic honey consumers. The distinctive features of Romanian consumers also include a low attention paid to labels, related in a low awareness of the energy content of honey. Quality cues are defined by search attributes of the bulk product (colour, taste, aroma, thickness), rather than credence attributes (warranties, brand name, country‐of‐origin). Marketers targeting this market should be aware of this scepticism towards label information, which necessitates more communication effort to built consumer trust.     

Differential mobility analyser transfer functions in scanning mode

A novel method is described for the calculation of the differential mobility analyser (DMA) transfer function in scanning mode, which is based on the derivation of an analytical solution for the non-diffusive particle trajectories inside the DMA, under exponentially varying electrical field and fully developed laminar flow. The scanning mode transfer functions can substantially improve the measurement accuracy of fast scanning mobility particle sizers (SMPS) as shown by Collins, Cocker, Flagan, and Seinfeld [(2004). The scanning DMA transfer function. Aerosol Science and Technology, 38, 833–850]. Compared to the Monte Carlo simulations described by Collins et al., the method developed here is much more accurate and sufficiently fast to be employed in advanced DMA inversion algorithms.