Effect of perforated concave delta winglet vortex generators on heat transfer and flow resistance through the heated tubes in the channel

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HASIL PENILAIAN SEJAWAT SEBIDANG ATAU PEER REVIEW KARYA ILMIAH : JURNAL ILMIAH

Judul Jurnal Ilmiah (Artikel) : Effect of perforated concave delta winglet vortex generators on heat transfer and flow resistance through the heated tubes in the channel

Jumlah Penulis : 5 orang (Yafid Effendi, Amrih Prayogo, Syaiful, M. Djaeni & Eflita Yohana) Status Pengusul : penulis Ke-5

Identitas Jurnal Ilmiah : a. Nama Jurnal : Experimental Heat Transfer

b. Nomor ISSN : ISSN:0891-6152, E-ISSN:1521-0480 c. Vol, No., Bln Thn :

d. Penerbit : Taylor & Francis

e. DOI artikel (jika ada) : https://doi.org/10.1080/08916152.2021.1919245 f. Alamat web jurnal : https://www.tandfonline.com/doi/abs/10.1080/0891615

2.2021.1919245 Alamat Artikel : https://doc-

pak.undip.ac.id/7652/1/Experimental_Heat_Transfer_20 21.pdf

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a. Kelengkapan unsur isi jurnal (10%) 4,00 3,50 3,75

b. Ruang lingkup dan kedalaman pembahasan (30%) 11,00 11,00 11,00

c. Kecukupan dan kemutahiran data/informasi dan metodologi (30%)

11,50 11,00 11,25

d. Kelengkapan unsur dan kualitas terbitan/jurnal (30%) 11,50 11,50 11,50

Total = (100%) 38,00 37,00 37,50

Nilai Pengusul = (40% x 37,50)/4 = 3,75

Semarang, Reviewer 2

Prof.Dr.rer.nat. Ir. A. P. Bayuseno, M.Sc.

NIP. 196205201989021001

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Prof. Dr. Jamari, S.T., M.T.

NIP. 197403042000121001

Unit Kerja : Departemen T.Mesin FT UNDIP

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Nilai Maksimal Jurnal Ilmiah

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Nasional Terakreditasi

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a. Kelengkapan unsur isi jurnal (10%) 4,00 4,00

b. Ruang lingkup dan kedalaman pembahasan (30%)

12,00 11,00

12,00 11,50

d. Kelengkapan unsur dan kualitas terbitan/jurnal (30%)

12,00 11,50

Total = (100%) 40,00 38,00

Nilai Pengusul = (40% x 38,00)/4 = 3,80 Catatan Penilaian artikel oleh Reviewer :

1. Kesesuaian dan kelengkapan unsur isi jurnal:

Penulisan artikel telah sesuai dengan “Guide for Author” (Title, Abstract, Introduction, Materials and Methods, Results and Discussion, Conclusion, References). Substansi artikel sangat sesuai bidang ilmu pengusul yaitu tentang perpindahan panas dan mekanika fluida (Teknik Mesin dengan keahlian konversi energi). (skor=4,00).

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Artikel sesuai dengan ruang lingkup jurnal yaitu bidang teknik mesin. Hasil yang ditampilkan detil, kedalaman analisis sangat baik, menggunakan 13 dari 30 referensi. (skor=11)

3. Kecukupan dan kemutakhiran data/informasi dan metodologi:

Informasi yang disajikan menunjukkan adanya kebaruan. Artikel tentang pengaruh concave delta winglet terhadap perpindahan panas dan hambatan laju aliran tergolong baru dan mutakhir. Artikel menggunakan 30 referensi, seluruh referensi merupakan artikel dari jurnal bereputasi yang terbit dalam waktu 5 th terakhir. (skor = 11,50).

4. Kelengkapan unsur dan kualitas terbitan:

Jurnal tergolong dalam Jurnal Internasional Bereputasi, tata tulis dan tata bahasa baik menunjukkan proses review dan kualitas jurnal yang baik (terindeks Scopus, dengan SJR: 0,76, (Q1). (skor = 11,50)

Prof. Dr. Jamari, S.T., M.T.

NIP. 197403042000121001

Unit Kerja : Departemen T.Mesin FT UNDIP 40

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LEMBAR

Nilai Maksimal Jurnal Ilmiah

Nilai Akhir Yang Diperoleh Internasional

Nasional Terakreditasi

Nasional Tidak Terakreditasi

a. Kelengkapan unsur isi jurnal (10%) 4,00 3,50

b. Ruang lingkup dan kedalaman pembahasan (30%)

12,00 11,00

d. Kelengkapan unsur dan kualitas terbitan/jurnal (30%)

12,00 11,50

Total = (100%) 40,00 37,00

Nilai Pengusul = (40% x 37,00)/4 = 3,70 Catatan Penilaian artikel oleh Reviewer :

a) Kesesuaian dan kelengkapan unsur isi jurnal:

Artikel tentang perpindahan panas dan mekanika fluida, termasuk dalam bidang keahlian di Teknik Mesin. Tata tulis artikel yang meliputi: Title, Abstract, Introduction, Materials and methods, Results and Discussion, Conclusion, References telah sesuai dengan petunjuk penulisan yang ada. (nilai: 3,5)

b) Ruang lingkup dan kedalaman pembahasan:

Kajian yang dimuat artikel sesuai dengan ruang lingkup jurnal. Analisis yang dipaparkan di dukung data yang lengkap dan relevan. Analisis menggunakan rujukan pustaka yang memadai (menggunakan 43 % dari referensi yang digunakan). (nilai: 11)

c) Kecukupan dan kemutakhiran data/informasi dan metodologi:

Hasil Turnitin similarity index mendapatkan hasil 7 %, hal ini menunjukkan artikel bebas dari plagiasi. Seluruh pustaka yang disitasi, merupakan jurnal bereputasi yang terbit dalam 5 tahun terakhir. (nilai: 11)

d) Kelengkapan unsur dan kualitas terbitan:

Artikel terbit pada jurnal terindeks Scopus Q1, SJR: 0,76 (tahun 2020). (nilai: 11,50)

Prof.Dr.rer.nat. Ir. A. P. Bayuseno, M.Sc.

NIP. 196205201989021001

Unit Kerja : Departemen T. Mesin FT UNDIP 40

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Effect of perforated concave delta winglet vortex generators on heat transfer and flow resistance through the heated tubes in the channel

E endi Y. , Prayogo A., Syaiful, Djaeni M., Yohana E.

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Doctoral Program of Department of Mechanical Engineering, Diponegoro University, Semarang, Indonesia Department of Mechanical Engineering, Muhammadiyah University of Tangerang, Tangerang, Indonesia Department of Mechanical Engineering, Diponegoro University, Semarang, Indonesia

Department of Chemical Engineering, Diponegoro University, Semarang, Indonesia

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This study focuses on improving heat transfer from the surface of heated tubes to airflow in the channel. Perforated concave delta winglet vortex generators, which have not been used in previous

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Effect of perforated concave delta winglet vortex generators on heat transfer and flow resistance Effect of perforated

through the heated tubes in the channel

Ya d E endi, Amrih Prayogo, Syaiful, M. Djaeni & E ita Yohana

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Transient forced convective heat transfer of helium gas in a narrow tube heated by exponential time- varying heat source

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Effect of new punched vortex generators in a rectangular channel on heat transfer using Taguchi method

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ARTICLE

Effect of perforated concave delta winglet vortex generators on heat transfer and flow resistance through the heated tubes in the channel

Yafid Effendi ^a,b, Amrih Prayogo^c, Syaiful ^c, M. Djaeni ^d, and Eflita Yohana ^c

aDoctoral Program of Department of Mechanical Engineering, Diponegoro University, Semarang, Indonesia;

bDepartment of Mechanical Engineering, Muhammadiyah University of Tangerang, Tangerang, Indonesia;

cDepartment of Mechanical Engineering, Diponegoro University, Semarang, Indonesia; ^dDepartment of Chemical Engineering, Diponegoro University, Semarang, Indonesia

ABSTRACT

This study focuses on improving heat transfer from the surface of heated tubes to airflow in the channel. Perforated concave delta winglet vortex generators, which have not been used in previous studies, were implemen- ted in this study to increase the heat transfer rate. In this experimental study, the comparison of perforated concave delta winglet and perforated delta winglet was investigated in terms of increased heat transfer from a heated six-tube surface to the flow in a rectangular channel. The experimental results indicated that the use of perforated concave delta winglet vortex generators could increase the heat transfer rate of 46.3% toward the base- line. However, the optimal thermal-hydraulic performance was found in the use of the concave delta winglet at 1.37 with a staggered vortex generators arrangement. The results of this study indicated that the use of perforated vortex generators could reduce the pressure drop with a slight decrease in the heat transfer rate.

ARTICLE HISTORY Received 24 December 2020 Accepted 15 April 2021 KEYWORDS

Perforated concave delta winglet; longitudinal vortex;

convection heat transfer coefficient; pressure drop

Introduction

Currently, the increased use of air conditioning has resulted in an increase in global energy consump- tion. Therefore, the performance of the AC system is very important to consider [1]. One approach to improve the performance of an AC system is minimizing the thermal resistance of the condenser. In the condenser, the airside thermal resistance is the main problem that causes the low heat transfer rate [2]. Therefore, it is very important to minimize airside thermal resistance.

According to Sadeghianjahromi et al., the airside thermal resistance can be reduced by installing the longitudinal vortex generators (LVG) on the fin side in the fin and tube heat exchanger [3]. The LVG induces a longitudinal vortex (LV) within the main flow that increases the flow fluctuation and provides a swirling action that causes the thinning of the thermal boundary layer on the surface of the fin resulting in an increase in the heat transfer rate. Further, LV can increase the heat transfer rate in the wake region behind the tube [3, 4]. Tang et al. [5] conducted research on rectangular winglet pairs (RWP) VG and delta winglet pairs (DWP) VG. Their study shows an increase in the heat transfer for the case where RWP VGs are higher than DWP VGs; however, the thermal-hydraulic performance in the case of DWP VG is higher. In addition, the thermal-hydraulic performance of the common flow up (CFU) configuration is higher than that of the common flow down (CFD) configuration. Based on the field synergy principle, the results of Tang et al.’s study showed that the synergy angle of using RWP VGs with the CFU configuration is smaller than that of using DWP VGs with CFD

CONTACT Yafid Effendi [email protected] Doctoral Program of Department of Mechanical Engineering, Diponegoro University, Semarang, Indonesia

EXPERIMENTAL HEAT TRANSFER https://doi.org/10.1080/08916152.2021.1919245

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Transient forced convective heat transfer of helium gas in a narrow tube heated by exponential time-varying heat source

Feng Xu, Qiusheng Liu, and Makoto Shibahara

Department of Marine Engineering, Graduate School of Maritime Sciences, Kobe University, Higashinada-ku, Kobe, Japan

ABSTRACT

The analysis and evaluation of transient heat transfer are essential to predict stability and safety of helium gas cooling fusion blanket due to plasma disruption. In this study, transient turbulent heat transfer characteristics of helium gas flowing in a narrow tube were experimentally investigated by using a forced convection gas loop. A narrow tube with an inner diameter of 1.8 mm was employed as test heater and heated exponentially increasing with time under various e-folding time of heat generation rate (0.04–15 s), flow velocities (101–248 m/s), inlet gas temperatures (293–313 K), and pres- sures (298–502 kPa). The experimental results showed that the heat transfer process can be separated into transient-state heat transfer and quasi-steady- state one at the e-folding time of near 1.5 s. The dependence of quasi-steady- state heat transfer on gas pressure and flow velocity was significant, but the transient-state one was less dependent on gas pressure and flow velocity.

The influence of inlet gas temperature on the heat transfer coefficient was not obvious under both transient and quasi-steady conditions. A semi- empirical correlation of the relationship between transient-state and steady- state heat transfer was developed based on substantial experimental data by employing a nondimensional parameter of Fourier number.

ARTICLE HISTORY Received 19 January 2021 Accepted 3 May 2021 KEYWORDS Transient heat transfer;

forced convection; narrow tube; helium gas; e-folding time

Introduction

Fusion energy is clean, safe, and practically inexhaustible energy source possessing huge development potential, but the final commercialization of fusion reactor still requires more research and work [1].

The blanket is the vital component of fusion reactor with main functions of energy conversion, tritium breeding, and neutron shield. The coolants circulated in the blanket are required to remove high heat input with surface heat flux of 0.5–1.0 MW/m²on the first wall under steady state [2]. Helium gas (He) is employed as coolant extensively applying in dual coolant lead lithium (DCLL) [3], helium cooled lithium lead (HCLL) [4], helium cooled pebble bed (HCPB) [5] blankets, etc. Not only the conversion efficiency for fusion energy to thermal energy but also analysis for operation accidents should be taken into serious consideration in the thermal-hydraulics design of He cooling blanket. The disruption of plasma releases huge magnetic energy deposited on plasma facing components causing the transient- state heat transfer. The surface heat flux will increase very sharply in several milliseconds, which results in melting, ablation, and vaporization of surface materials [6]. Fundamental experimental study on heat transfer characteristics under transient condition for forced convection of He through the channels mounted in blankets is indispensable and provides a database for the safety evaluation of fusion reactor operation.

Researches with regard to transient heat transfer process of forced convective flow with time- varying heat load have been carried out by some researchers. Kawamura [7] researched the heat

CONTACT Qiusheng Liu [email protected] Department of Marine Engineering, Graduate School of Maritime Sciences, Kobe University, Higashinada-ku, Kobe Japan

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Effect of new punched vortex generators in a rectangular channel on heat transfer using Taguchi method

S. Caliskan^a, A. Dogan^b, and U. R. Sahin^a

aDepartment of Mechanical Engineering, Faculty of Engineering, Hitit University, Corum, Turkey; ^bDepartment of Mechanical Engineering, Faculty of Engineering, Akdeniz University, Antalya, Turkey

ABSTRACT

In this study, the effects of New Punched Rectangular Vortex Generators (NPRVGs) and Punched Rectangular Vortex Generators (PRVGs) inside a rectangular channel on heat transfer augmentation, Nusselt number, and friction factor were experimentally investigated. Temperature contours and average Nusselt numbers analyzed heat transfer characteristics resulting from the use of vortex generators. Furthermore, this study investigated the optimum values of the design parameters within the system of vortex generators by using the Taguchi method, and the orthogonal experimental plan was made for L16 (4³x2¹). Reynolds numbers (5181, 10363, 20328, 25510), winglet arrangement, winglet attack angles (15°, 30°, 45°, 75°) and a distance of punched winglet from the channel bottom (b) to constant winglet height (e = 25 mm) (b/e = 0.04, 0.12, 0.2 and 0.36) were determined the working parameters in the experiments. Measurements are carried out for a rectangular channel with aspect ratio AR = 2, winglet transverse pitch (S) to longitudinal winglet height (e) ratio of S/e = 0.67 and a winglet height (e) to channel height (H = 25 mm) ratio of e/H = 1. Heat transfer rates of NPRVGs and PRVGs were compared to the obtained results for a smooth channel. The heat transfer performance is improved considerably by the NPRVGs. The maximum thermal performance factor increased from 0.99 to 1.89 owing to the combination of the vortex generator and the newly punched hole.

ARTICLE HISTORY Received 21 January 2021 Accepted 3 May 2021 KEYWORDS

Heat transfer; new punched vortex generators; Taguchi method; channel flow

Introduction

In many engineering applications, a large amount of heat is generated due to the system’s operation.

Failure to remove this heat from the system sufficiently could cause overheating problems and damage the system. In recent years, various methods have been developed by researchers to prevent overheating in these systems. These methods are active and passive. Passive methods do not require a power supply, but active systems require it. The most common method for removing heat in passive systems is to increase the heat transfer surface. In this way, heat transfer is increased by adding the fins on the heat transfer surface, using vortex generators in different geometries, or by adding fins in different geometries. Vortex generator is a promising passive technique to produce longitudinal vortices (LVs), inducing strong swirling motion that brings about the enhancement of heat transfer at a modest expense of the additional pressure loss [1]. Experimental and numerical studies related to different channel section geometries and the use of vortex generators in different geometries have been determined in the literature. These studies are summarized below.

Chamoli [2] investigated experimentally the optimum design parameters of V-turbulators with holes in a rectangular channel using the Taguchi experimental design method. The experimental parametric study was made for Reynolds number, open area ratio, relative roughness height, and

CONTACT S. Caliskan [email protected] Department of Mechanical Engineering, Faculty of Engineering, Hitit University, Corum, Turkey