Faculty of Engineering, Okayama UniversityActa Medica Okayama0475-00714112007Heat and Mass Transfer Analysis of Fluidized Bed Grain Drying5262ENHideoInabaAkihikoHoribeNaotoHaruki10.18926/14084The effects of heat and mass transfer parameters on the efficiency of fluidized bed drying have been studied to optimize the input and output conditions. The analysis was carried out using two different materials, wheat and corn. Energy and exergy models based on the first and second
law of thermodynamic are developed. Furthermore, some unified non-dimensional experimental correlations for predicting the efficiency of fluidized bed drying process have been proposed. The effects of hydrodynamics and thermodynamics conditions such as the inlet air temperature, the initial moisture content and well known Fourier and Reynolds numbers on energy efficiency and exergy
efficiency were analyzed using the developed model. A good agreement was achieved between the model predictions, non-dimensional correlations and the available experimental results.No potential conflict of interest relevant to this article was reported.社団法人日本機械学会Acta Medica Okayama0387-5016615891995界面活性剤添加水溶液の管内流動抵抗軽減と熱伝達206212ENHideoInabaKoichiOzakiNaotoHarukiHideakiAsanoThe reduction characteristics of flow resistance and heat transfer of water solution flow with the surfactant (Cetyltrimethyl-ammonium Bromide) in tubes were investigated experimentally. The flow resistance and heat transfer of Water solution flow with the surfactant were markedly reduced as compared with those of pure water flow. Useful nondimensional correlative equations of flow resistance and heat transfer were derived in terms of various non-dimensional parameters.No potential conflict of interest relevant to this article was reported.社団法人日本機械学会Acta Medica Okayama0387-5016636081997冷熱エネルギー輸送用界面活性剤添加低温水の管内流動抵抗と熱伝達特性208215ENHideoInabaNaotoHarukiInvestigation of characteristics of cold water pipe flow with surfactant is important to develop a cold heat energy transport system. Both flow drag and heat transfer reductions by the Toms effect occur due to a rod-like micell structure of surfactant. When a counter-ion (sodium salicylate) was added to water solution containing of dodecyltrimethylammonium chloride (DATC) surfactant in the present study, the rod-like micell structure of DTAC was formed by connection of spherical micells of DTAC. Moreover, the reduction characteristics of flow resistance and heat transfer were influenced by the amount of the counter-ion. Useful nondimensional correlative equations for flow resistance and heat transfer are derived in terms of various nondimensional parameters.No potential conflict of interest relevant to this article was reported.社団法人日本機械学会Acta Medica Okayama0387-5016646211998繊維質系流動抵抗軽減剤添加水の直管内流動抵抗および熱伝達特性178185ENHideoInabaNaotoHarukiAkihikoHoribeKoichiOzakiSome kinds of surfactants are useful to reduce flow drag in a turbulent pipe flow by Toms effect. However, it needs a lot of cost to make these surfactant harmless material to the environment. On the other hand, the fibrous substance such as pulp fibers and cellulose are harmless additives to the environment. This paper has dealt with the flow drag reduction and heat transfer characteristics of the water suspension flow mixed with fine fibers in a straight pipe. Measurements of velocity and temperature profile in a circular pipe flow were made in order to examine the flow drag and heat transfer characteristics of the turbulent and laminar flow. The nondimensional equations of pipe flow resistance and heat transfer were derived in terms of various nondimensional parameters.No potential conflict of interest relevant to this article was reported.社団法人日本機械学会Acta Medica Okayama0387-5016666472000管内流動抵抗低減用界面活性剤を添加した低温水の曲がり管部における流動抵抗低減効果と熱伝達特性204211ENHideoInabaNaotoHarukiAkihikoHoribeThis paper has dealt with the flow resistance and heat transfer characteristics of flowing cold water with flow drag reduction additive in curved pipes. A cationic surfactant was used as the flow drag reduction additive. The flow drag resistance and the local heat transfer coefficient of cold water flow in some curved pipes were measured under the constant heat flux heating wall condition. It was found that the flow drag and heat transfer reduction effect by the surfactant was depended on the angle and curved ratio of the curved pipes. The nondimensional correlative equations of flow resistance and heat transfer coefficient of cold-water flow with the surfactant in the curved pipe were derived in terms of various nondimensional parameters.No potential conflict of interest relevant to this article was reported.社団法人日本機械学会Acta Medica Okayama0387-5016686662002ワイヤーコイルを用いた流動抵抗低減用界面活性剤添加水の直円管内熱伝達促進191198ENHideoInabaNaotoHarukiToruNakataAkihikoHoribeNaoyukiFurumotoKenjiSatoThis paper has dealt with the heat transfer enhancement of flowing water with flow drag reduction additive into a heat transfer tube by inserting wire coils. The non-ion type surfactant was used as the additive to decrease the pipe flow resistance for the heat energy transport system. However, the decrease in the flow resistance was allowed to reduce the heat transfer coefficient in the heat transfer tube. Some kinds of wire coils having different diameters were tried to enhance the heat transfer in the heat transfer tube. The effects of wire coils on the pipe friction and the heat transfer coefficients were elucidated under various experimental parameters of flow velocity, wire coil diameter, pitch and length.No potential conflict of interest relevant to this article was reported.社団法人日本機械学会Acta Medica Okayama0387-5016686692002ゲル状潜熱蓄冷熱体混合水からの空気泡群による直接接触採冷熱221228ENHideoInabaAkihikoHoribeNaotoHarukiMasahiroMurakamiThis paper has dealt with cold heat extraction characteristics from the gel latent-cold-heat storage-material suspension with surfactant to air bubbles. The gel latent-cold-heat storage-material consisted of n-paraffin as the core latent-cold-heat storage-material and water as a heat transfer medium. The relationship between outflow air temperature in latent-cold-heat release process and various parameters was examined experimentally. As a result, especially concentration of the gel latent material added to water exerted an influence on gas holdup and cold heat extraction characteristics to air bubbles. The non-dimensional correlation equations for the temperature effectiveness of latent-heat storage process were derived in terms of the ratio of water layer height to diameter of latent heat material, Reynolds number of air flow, Stefan number and modified Stefan number including air humidity.No potential conflict of interest relevant to this article was reported.社団法人日本機械学会Acta Medica Okayama0387-5016706902004減圧下における水蒸気凝結現象を利用した固-液相マイクロカプセルスラリー潜熱蓄熱材の採熱特性444451ENMasatoshiKatayamaHideoInabaAkihikoHoribeNaotoHarukiTsuyoshiManabeRecently, studies have begun on a functional heat transfer medium using fine spherical microcapsules encapsulated with phase-change material and dispersed in water. This enables the medium to maintain fluidity whether the phase-change material is solid or liquid. The present study has clarified the laten-heat storage characteristics of microcapsule slurry by increasing its heat transfer coefficient with the help of evolved heat condensing of vapor from the slurry in heat storage. Paraffin wax with the melting point of 62℃ was encapsulated into the fine microcapsules and used as a phase-change material. The cooling coil surface temperature and concentration of paraffin in the microcapsule slurry were selected as the experimental parameters. As a result, the non-dimensional correlation equations of the heat release completion time and heat transfer coefficient were derived in terms of non-dimensional parameters.No potential conflict of interest relevant to this article was reported.社団法人日本機械学会Acta Medica Okayama0387-5016717022005直円管内を流動する界面活性剤添加有機プラインの流動抵抗と熱伝達挙動573580ENNaotoHarukiHideoInabaAkihikoHoribeShinjiTanakaToruNakataKenjiSatoThe flow drag and heat transfer reduction effects of brine flow with drag reduction surfactants have been investigated from the viewpoint of the effective energy consumption in an industrial cooling system. In this study, Oleyldihy-droxyetyl Amine Oxide (ODEAO) of non-ion surfactant was used as a drag reduction surfactant additive, and Ethylene Glycol (EG) was used as a organic brine. It was found that the viscosity of EG brine with ODEAO had the non-Newtonian behavior. The flow friction coefficient and mean forced convection heat transfer coefficient of the EG brine with ODEAO in a straight pipe were measured for each parameter of concentration of EG, concentration of ODEAO and temperature of the brine with ODEAO. The obtained experimental results indicated that the EG brine with ODEAO exerted an influence on the flow drag and heat transfer reduction.No potential conflict of interest relevant to this article was reported.Acta Medica Okayama1998流動抵抗低減剤添加水の管内流動挙動と熱伝達に関する研究ENNo potential conflict of interest relevant to this article was reported.