7 research outputs found
Role of impregnated lubricant in enhancing thermosyphon performance
We report on the optimal configuration for enhanced heat transfer performance of a two-phase closed thermosyphon (TPCT), incorporating a superhydrophilic (SHi) evaporator with a slippery lubricant-infused porous surface (SLIPS) condenser (TPCT-SHiSL). For the conditions examined, the overall heat transfer performance of the TPCT-SHiSL was enhanced by as much as 28.9% compared to the other configurations proposed. This enhancement is attributed to the use of SLIPS as the condenser, which promotes the condensation heat transfer and the overall heat transfer performance. Moreover, we illustrate the importance of pairing the SLIPS condenser with a SHi evaporator, in order to minimize lubricant absorption at the evaporator. Additionally, the heat transfer performance of the TPCT-SHiSL was evaluated over time and consistent results were observed even after 16 experimental runs (192Â h in 90Â days), demonstrating good durability of the TPCT-SHiSL
Enhanced Coalescence-Induced Droplet-Jumping on Nanostructured Superhydrophobic Surfaces in the Absence of Microstructures
Superhydrophobic
surfaces are receiving increasing attention due to the enhanced condensation
heat transfer, self-cleaning, and anti-icing properties by easing
droplet self-removal. Despite the extensive research carried out on
this topic, the presence or absence of microstructures on droplet
adhesion during condensation has not been fully addressed yet. In
this work we, therefore, study the condensation behavior on engineered
superhydrophobic copper oxide surfaces with different structural finishes.
More specifically, we investigate the coalescence-induced droplet-jumping
performance on superhydrophobic surfaces with structures varying from
the micro- to the nanoscale. The different structural roughness is
possible due to the specific etching parameters adopted during the
facile low-cost dual-scale fabrication process. A custom-built optical
microscopy setup inside a temperature and relative humidity controlled
environmental chamber was used for the experimental observations.
By varying the structural roughness, from the micro- to the nanoscale,
important differences on the number of droplets involved in the jumps,
on the frequency of the jumps, and on the size distribution of the
jumping droplets were found. In the absence of microstructures, we
report an enhancement of the droplet-jumping performance of small
droplets with sizes in the same order of magnitude as the microstructures.
Microstructures induce further droplet adhesion, act as a structural
barrier for the coalescence between droplets growing on the same microstructure,
and cause the droplet angular deviation from the main surface normal.
As a consequence, upon coalescence, there is a decrease in the net
momentum in the out-of-plane direction, and the jump does not ensue.
We demonstrate that the absence of microstructures has therefore a
positive impact on the coalescence-induced droplet-jumping of micrometer
droplets for antifogging, anti-icing, and condensation heat transfer
applications
Safety assessment of sorafenib in Chinese patients with unresectable hepatocellular carcinoma: subgroup analysis of the GIDEON study
Abstract Background This study aimed to investigate the safety of sorafenib for the treatment of unresectable hepatocellular carcinoma in Chinese patients. Methods A subgroup of 345 Chinese patients from the international database of the Global Investigation of therapeutic DEcisions in hepatocellular carcinoma and Of its treatment with sorafeNib (GIDEON) study was included in this analysis. Safety assessment measures were adverse events (AEs) and serious adverse events (SAEs) graded using the National Cancer Institute Common Terminology Criteria version 3.0. Results Of 331 evaluable patients, 98% started sorafenib at 800 mg/day. The median treatment duration was 22 weeks (range, 0.1–116 weeks), and median overall survival (OS) was 322 days (10.7 months). Approximately 50% of patients had at least one adverse event, and 6% had grade 3–4 adverse events. Drug-related adverse events were experienced by 29% of patients, and 3.6% had grade 3–4 drug-related adverse events. Overall, 23% of patients (n = 77) experienced serious adverse events, among which only 1 event was drug-related (0.3%). No differences in overall adverse events, serious adverse events, and deaths were observed between Child-Pugh A and Child-Pugh B patients. The most frequent drug-related adverse events were dermatological/skin (24%), hand-foot skin reaction (20%), gastrointestinal (11%), and diarrhea (11%). The majority of adverse events occurred within 30 days of beginning sorafenib. Conclusion Sorafenib has satisfactory efficacy and safety in Chinese Child-Pugh A and B patients with unresectable HCC using the recommended dosage of 800 mg/day, and the safety of sorafenib is not affected by liver function. Prophylaxis for gastrointestinal adverse events may help to decrease dose interruptions or discontinuation. Trial registration ClinicalTrials.gov; Identifier: NCT00812175. Date of registration: December 19, 2008