A economia mundial é fortemente dependente da disponibilidade de óleo, no entanto as reservas de óleo leve, mais atrativas ao mercado, tendem nos próximos anos ao esgotamento, trazendo à luz as reservas de óleo pesado para atender as demandas do mercado. No entanto, os processos associados ao transporte e processamento desses óleos viscosos consomem muita energia, impondo um grande desafio para a indústria do petróleo. Nesse contexto, se transportar óleos viscosos com água através de um escoamento bifásico em padrão Core Annular Flow (CAF) é muito promissor. Nessa prática, uma película anular de água envolve o núcleo que contém o óleo, minimizando o contato entre este e a parede do duto e reduzindo as perdas de energia por atrito. Visou o presente estudo mapear os padrões de escoamento de óleo pesado com água em dutos horizontais e verticais, mensurar os fatores de redução de potência e do diferencial de pressão associados à um trecho reto e à uma válvula de gaveta aberta e determinar o holdup para avaliar a eficiência do CAF. Para atingir esses objetivos, uma unidade de bancada foi construída, consistindo de tanques de armazenamento e de separação da mistura. Interligando os tanques, foram dispostos dutos transparentes com 27 mm de diâmetro interno e 8 m de extensão, contendo duas seções horizontais e uma vertical para análise e diversos acessórios hidráulicos. O óleo utilizado possuía viscosidade de 3200 cP a 22 °C e densidade de 945 kg/m3 . Os resultados experimentais demonstraram haver diversas configurações de fluxo segundo o posicionamento do duto, e que a diferença de densidade dos fluidos descentraliza o óleo nos escoamentos horizontais. Além disso, o trecho vertical intercalado entre os trechos horizontais se comportou como um retificador de fluxo, melhorando os índices do CAF. Foi determinado um fator de redução de perda de pressão máximo de 250 vezes para o trecho reto e de 12 vezes para a válvula de gaveta. O fator global máximo de redução de potência foi mensurado em 2,2 vezes. Concluiu-se que, para um trecho reto, o projeto de instalações hidráulicas para o escoamento bifásico deve considerar 15 % a mais de perda de carga em relação ao escoamento de água pura. Já para a válvula de gaveta, esse fator deve ser de 700 %. / The world economy is strongly dependent on the availability of oil, however, light oil reserves, more market-oriented, tend to deplete in coming years, bringing to light the heavy oil reserves to meet the demands of the market. However, the processes associated with the transportation and production of these viscous oils consume a lot of energy and pose a great challenge for the oil industry. In this context, transporting viscous oils through a liquid-liquid two-phase oil-water flow in a core annular pattern (CAF) is very promising. In this method, an annular water film surrounds the oil-containing core, minimizing its contact with the pipe wall and reducing energy losses by friction. The aim of the present work was to map the flow patterns of a biphasic oil-water flow in horizontal and vertical pipes, to evaluate the overall energy savings provided by the CAF technique, to measure the pressure gradient reduction factor along the pipe and in a gate valve and to determine the holdup as a way of assessing the energy efficiency of the biphasic oil-water flow transport. To achieve these goals, an experimental facility was built and it consisted of cargo and separation tanks. Connecting these tanks, approximately 8 m of 27mm-ID clear transparent PVC pipes, two horizontal and one vertical sections and various hydraulic fittings. It was used in the tests lubricating oil with 3200 cP and 945 kg/m3 at 22°C and distilled water. The experimental results showed that there are several flow configurations according to the pipe positioning, and that the oil and the water density difference decentralizes the oil core in horizontal flows. In addition, the vertical section placed between the two horizontal ones behaved like a flow rectifier, improving the core annular flow energy savings basis. An average pressure gradient reduction factor of 250 times in a straight pipe and of 12 times in a gate valve was determined. The maximum overall power reduction factor was measured as being 2.2 times. It was concluded that the design of a hydraulic installation to transport heavy oil with water in a core annular pattern should consider a pressure drop increase by a factor of 15 % in a straight pipe and by a factor of 700 % in a gate valve based on the monophasic water transport at similar flow rates.

A economia mundial é fortemente dependente da disponibilidade de óleo, no entanto as reservas de óleo leve, mais atrativas ao mercado, tendem nos próximos anos ao esgotamento, trazendo à luz as reservas de óleo pesado para atender as demandas do mercado. No entanto, os processos associados ao transporte e processamento desses óleos viscosos consomem muita energia, impondo um grande desafio para a indústria do petróleo. Nesse contexto, se transportar óleos viscosos com água através de um escoamento bifásico em padrão Core Annular Flow (CAF) é muito promissor. Nessa prática, uma película anular de água envolve o núcleo que contém o óleo, minimizando o contato entre este e a parede do duto e reduzindo as perdas de energia por atrito. Visou o presente estudo mapear os padrões de escoamento de óleo pesado com água em dutos horizontais e verticais, mensurar os fatores de redução de potência e do diferencial de pressão associados à um trecho reto e à uma válvula de gaveta aberta e determinar o holdup para avaliar a eficiência do CAF. Para atingir esses objetivos, uma unidade de bancada foi construída, consistindo de tanques de armazenamento e de separação da mistura. Interligando os tanques, foram dispostos dutos transparentes com 27 mm de diâmetro interno e 8 m de extensão, contendo duas seções horizontais e uma vertical para análise e diversos acessórios hidráulicos. O óleo utilizado possuía viscosidade de 3200 cP a 22 °C e densidade de 945 kg/m3 . Os resultados experimentais demonstraram haver diversas configurações de fluxo segundo o posicionamento do duto, e que a diferença de densidade dos fluidos descentraliza o óleo nos escoamentos horizontais. Além disso, o trecho vertical intercalado entre os trechos horizontais se comportou como um retificador de fluxo, melhorando os índices do CAF. Foi determinado um fator de redução de perda de pressão máximo de 250 vezes para o trecho reto e de 12 vezes para a válvula de gaveta. O fator global máximo de redução de potência foi mensurado em 2,2 vezes. Concluiu-se que, para um trecho reto, o projeto de instalações hidráulicas para o escoamento bifásico deve considerar 15 % a mais de perda de carga em relação ao escoamento de água pura. Já para a válvula de gaveta, esse fator deve ser de 700 %. / The world economy is strongly dependent on the availability of oil, however, light oil reserves, more market-oriented, tend to deplete in coming years, bringing to light the heavy oil reserves to meet the demands of the market. However, the processes associated with the transportation and production of these viscous oils consume a lot of energy and pose a great challenge for the oil industry. In this context, transporting viscous oils through a liquid-liquid two-phase oil-water flow in a core annular pattern (CAF) is very promising. In this method, an annular water film surrounds the oil-containing core, minimizing its contact with the pipe wall and reducing energy losses by friction. The aim of the present work was to map the flow patterns of a biphasic oil-water flow in horizontal and vertical pipes, to evaluate the overall energy savings provided by the CAF technique, to measure the pressure gradient reduction factor along the pipe and in a gate valve and to determine the holdup as a way of assessing the energy efficiency of the biphasic oil-water flow transport. To achieve these goals, an experimental facility was built and it consisted of cargo and separation tanks. Connecting these tanks, approximately 8 m of 27mm-ID clear transparent PVC pipes, two horizontal and one vertical sections and various hydraulic fittings. It was used in the tests lubricating oil with 3200 cP and 945 kg/m3 at 22°C and distilled water. The experimental results showed that there are several flow configurations according to the pipe positioning, and that the oil and the water density difference decentralizes the oil core in horizontal flows. In addition, the vertical section placed between the two horizontal ones behaved like a flow rectifier, improving the core annular flow energy savings basis. An average pressure gradient reduction factor of 250 times in a straight pipe and of 12 times in a gate valve was determined. The maximum overall power reduction factor was measured as being 2.2 times. It was concluded that the design of a hydraulic installation to transport heavy oil with water in a core annular pattern should consider a pressure drop increase by a factor of 15 % in a straight pipe and by a factor of 700 % in a gate valve based on the monophasic water transport at similar flow rates.

遊戲式學習已被證實能夠有效提升學習者的學習成效，而遊戲的愉悅度是否設計得越強烈，對學習成效越有幫助，是個值得探索的問題。此外，遊戲過程中，有哪些遊戲設計要素能夠影響學習成效，同時讓學習者在遊戲中亦能夠感到趣味性，進而達到學習目標，值得我們關切。再者，學習的專注力及情緒在學習型遊戲設計中，也是必須納入考量的面向。因此，本研究分別探討兩款在遊戲設計要素上具有顯著差異的英文單字學習APP，對於學習者學習成效、專注力、放鬆度及單字記憶保留上的影響。 本研究以馬祖高中高三的36位學生為研究對象，根據英語字彙前測成績及性別將其隨機分派至兩款在遊戲設計要素上具有顯著差異的英文單字學習APP，進行四週的英語字彙學習。結果顯示遊戲設計要素較低的組別的學習者，在英文單字學習成效、單字記憶保留上的成效均顯著優於遊戲設計要素較高組別學習者，同時放鬆度亦較高，而專注度不如遊戲設計要素較高的組別，且各依變項間彼此有顯著的正相關。此外，本研究亦進一步證實性別差異存在於不同遊戲設計要素的英語字彙學習APP中，在遊戲設計要素較低的英文單字學習APP中，發現女性學習者擁有顯著較優的英語字彙學習成效及記憶保留度。而本研究也發現「符合程度的挑戰性」為設計遊戲式英文單字學習APP時最需要重視的遊戲設計要素。 綜上所述，本研究證實相較於遊戲設計要素較高的高刺激性英文單字學習APP，遊戲設計要素較低的低刺激性英文單字遊戲APP對於學習成效、單字記憶保留上具有較正面的效應。此一結果顯示像英語字彙學習這樣的認知型學習，在遊戲設計上並不適合納入刺激性較高的遊戲設計要素。此外，對遊戲設計者來說，未來設計英文單字遊戲學習APP時，亦應將性別差異納入設計考量，同時儘可能在遊戲娛樂性及教育性中取得平衡。 / Game-based learning has been proved to effectively boost learners’ learning performance, while whether more enjoyment designed in the game brings better learning performance remains unknown. Besides, what game design factors will affect learning performance and simultaneously keep learners interested in the game is also worth investigating. Moreover, attention and emotion are two dimensions which should be taken into account when designing learning games. As a result, this study tries to assess the effects of using two different English vocabulary learning APPs with significantly different game design factors on learners’ performance, sustained attention, meditation, and vocabulary memory retention, respectively. A pilot study was conducted beforehand to examine whether the two considered English vocabulary game APPs differ significantly in game design factors including concentration, feedback, challenges match player skills, control, and immersion. In the formal study, thirty-six Grade 12 students from Matsu senior high school participated in this study. They were randomly divided into two experimental groups based on gender and pretest scores, separately using two English vocabulary game APPs with significantly different game design factors for English vocabulary learning. The study lasted for four weeks. Analytical results show that students using game with lower scores in game design factors generated significantly better vocabulary learning performance, memory retention and meditation level than those using game with higher scores in game design factors, while sustained attention level was lower. Also, they were significantly correlated to one another. Moreover, this study further confirms that gender differences existed among English vocabulary learning games with different game design factors. Girls were found to have significantly better English vocabulary learning performance and memory retention in the game APP with lower scores in game design factors. Furthermore, “challenge matches players’ skill” was found to be the most important game design factor when designing game-based English vocabulary learning APPs. In conclusion, this study confirms that English vocabulary game APPs with lower exciting elements have more positive learning effects on learning performance, memory retention than those with higher scores in game design factors. The result indicates that when designing games, higher exciting game design factors are not suitable for cognitive learning, such as English vocabulary learning. Finally, this study provides suggestions for future game-design developers to take gender differences into consideration when designing English vocabulary learning game APPs, and meanwhile tries to strike the balance between educational purpose and entertainment of the game APPs.